721507928650 has 48 divisors (see below), whose sum is σ = 1356414230808. Its totient is φ = 285520896000.

The previous prime is 721507928539. The next prime is 721507928677. The reversal of 721507928650 is 56829705127.

It is a happy number.

It can be written as a sum of positive squares in 12 ways, for example, as 4168380969 + 717339547681 = 64563^2 + 846959^2 .

It is a super-2 number, since 2×721507928650² (a number of 25 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors.

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, 1540110 + ... + 1953190.

Almost surely, 2^721507928650 is an apocalyptic number.

721507928650 is a deficient number, since it is larger than the sum of its proper divisors (634906302158).

721507928650 is a wasteful number, since it uses less digits than its factorization.

721507928650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413467 (or 413462 counting only the distinct ones).

The product of its (nonzero) digits is 2116800, while the sum is 52.

The spelling of 721507928650 in words is "seven hundred twenty-one billion, five hundred seven million, nine hundred twenty-eight thousand, six hundred fifty".