721248 has 48 divisors (see below), whose sum is σ = 2068416. Its totient is φ = 218240.

The previous prime is 721243. The next prime is 721261. The reversal of 721248 is 842127.

It is a tau number, because it is divible by the number of its divisors (48).

It is a hoax number, since the sum of its digits (24) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a d-powerful number, because it can be written as 7³ + 2¹⁷ + 2¹⁹ + 1 + 4⁸ + 8 .

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 721248.

It is not an unprimeable number, because it can be changed into a prime (721243) by changing a digit.

721248 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 715 + ... + 1397.

It is an arithmetic number, because the mean of its divisors is an integer number (43092).

2⁷²¹²⁴⁸ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 721248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1034208).

721248 is an abundant number, since it is smaller than the sum of its proper divisors (1347168).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

721248 is a wasteful number, since it uses less digits than its factorization.

721248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707 (or 699 counting only the distinct ones).

The product of its digits is 896, while the sum is 24.

The square root of 721248 is about 849.2632100827. The cubic root of 721248 is about 89.6798501611.

It can be divided in two parts, 7212 and 48, that added together give a triangular number (7260 = T₁₂₀).

The spelling of 721248 in words is "seven hundred twenty-one thousand, two hundred forty-eight".