721523887160 has 64 divisors (see below), whose sum is σ = 1686100600800. Its totient is φ = 277547200000.

The previous prime is 721523887153. The next prime is 721523887171. The reversal of 721523887160 is 61788325127.

It is a junction number, because it is equal to n+sod(n) for n = 721523887099 and 721523887108.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 947891 + ... + 1530210.

Almost surely, 2^721523887160 is an apocalyptic number.

It is an amenable number.

721523887160 is an abundant number, since it is smaller than the sum of its proper divisors (964576713640).

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

721523887160 is a wasteful number, since it uses less digits than its factorization.

721523887160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2478392 (or 2478388 counting only the distinct ones).

The product of its (nonzero) digits is 1128960, while the sum is 50.

The spelling of 721523887160 in words is "seven hundred twenty-one billion, five hundred twenty-three million, eight hundred eighty-seven thousand, one hundred sixty".