721430008 has 16 divisors (see below), whose sum is σ = 1456733880. Its totient is φ = 332967648.

The previous prime is 721429999. The next prime is 721430009. The reversal of 721430008 is 800034127.

It is a super-2 number, since 2×721430008² = 1040922512885760128, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721430009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3468310 + ... + 3468517.

Almost surely, 2^721430008 is an apocalyptic number.

It is an amenable number.

721430008 is an abundant number, since it is smaller than the sum of its proper divisors (735303872).

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

721430008 is a wasteful number, since it uses less digits than its factorization.

721430008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6936846 (or 6936842 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 721430008 is about 26859.4491380594. The cubic root of 721430008 is about 896.8739314098.

The spelling of 721430008 in words is "seven hundred twenty-one million, four hundred thirty thousand, eight".