721004724 has 72 divisors (see below), whose sum is σ = 1997879520. Its totient is φ = 217425600.

The previous prime is 721004707. The next prime is 721004747. The reversal of 721004724 is 427400127.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 79242 + ... + 87870.

Almost surely, 2^721004724 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 721004724, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (998939760).

721004724 is an abundant number, since it is smaller than the sum of its proper divisors (1276874796).

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

721004724 is a wasteful number, since it uses less digits than its factorization.

721004724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8861 (or 8856 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 27.

The square root of 721004724 is about 26851.5311295278. The cubic root of 721004724 is about 896.6976606218.

The spelling of 721004724 in words is "seven hundred twenty-one million, four thousand, seven hundred twenty-four".