721464 has 32 divisors (see below), whose sum is σ = 1883520. Its totient is φ = 229856.

The previous prime is 721451. The next prime is 721481. The reversal of 721464 is 464127.

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

It is a congruent number.

It is an unprimeable number.

721464 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102 + ... + 1205.

It is an arithmetic number, because the mean of its divisors is an integer number (58860).

2⁷²¹⁴⁶⁴ 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 721464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (941760).

721464 is an abundant number, since it is smaller than the sum of its proper divisors (1162056).

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

721464 is a wasteful number, since it uses less digits than its factorization.

721464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1339 (or 1335 counting only the distinct ones).

The product of its digits is 1344, while the sum is 24.

The square root of 721464 is about 849.3903696181. The cubic root of 721464 is about 89.6888017350.

The spelling of 721464 in words is "seven hundred twenty-one thousand, four hundred sixty-four".