856708007644 has 48 divisors (see below), whose sum is σ = 1553553741600. Its totient is φ = 412886073600.

The previous prime is 856708007633. The next prime is 856708007711. The reversal of 856708007644 is 446700807658.

It is a super-2 number, since 2×856708007644² (a number of 25 digits) contains 22 as substring.

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, 252789102 + ... + 252792490.

It is an arithmetic number, because the mean of its divisors is an integer number (32365702950).

Almost surely, 2^856708007644 is an apocalyptic number.

It is an amenable number.

856708007644 is a deficient number, since it is larger than the sum of its proper divisors (696845733956).

856708007644 is a wasteful number, since it uses less digits than its factorization.

856708007644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6454 (or 6452 counting only the distinct ones).

The product of its (nonzero) digits is 9031680, while the sum is 55.

The spelling of 856708007644 in words is "eight hundred fifty-six billion, seven hundred eight million, seven thousand, six hundred forty-four".