721050 has 96 divisors (see below), whose sum is σ = 2142720. Its totient is φ = 158400.

The previous prime is 721043. The next prime is 721051. The reversal of 721050 is 50127.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (721051) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 31339 + ... + 31361.

It is an arithmetic number, because the mean of its divisors is an integer number (22320).

2⁷²¹⁰⁵⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 721050, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1071360).

721050 is an abundant number, since it is smaller than the sum of its proper divisors (1421670).

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

721050 is a wasteful number, since it uses less digits than its factorization.

721050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68 (or 63 counting only the distinct ones).

The product of its (nonzero) digits is 70, while the sum is 15.

The square root of 721050 is about 849.1466304473. The cubic root of 721050 is about 89.6716429816.

Adding to 721050 its reverse (50127), we get a palindrome (771177).

It can be divided in two parts, 7210 and 50, that added together give a triangular number (7260 = T₁₂₀).

The spelling of 721050 in words is "seven hundred twenty-one thousand, fifty".