712721656 has 16 divisors (see below), whose sum is σ = 1341113040. Its totient is φ = 355091520.

The previous prime is 712721641. The next prime is 712721699. The reversal of 712721656 is 656127217.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 156276 + ... + 160771.

It is an arithmetic number, because the mean of its divisors is an integer number (83819565).

Almost surely, 2^712721656 is an apocalyptic number.

It is an amenable number.

712721656 is a deficient number, since it is larger than the sum of its proper divisors (628391384).

712721656 is a wasteful number, since it uses less digits than its factorization.

712721656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317334 (or 317330 counting only the distinct ones).

The product of its digits is 35280, while the sum is 37.

The square root of 712721656 is about 26696.8473045040. The cubic root of 712721656 is about 893.2506035861.

The spelling of 712721656 in words is "seven hundred twelve million, seven hundred twenty-one thousand, six hundred fifty-six".