856703645 has 16 divisors (see below), whose sum is σ = 1215423360. Its totient is φ = 567196224.

The previous prime is 856703621. The next prime is 856703657. The reversal of 856703645 is 546307658.

It is a de Polignac number, because none of the positive numbers 2^k-856703645 is a prime.

It is a super-2 number, since 2×856703645² = 1467882270712572050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 856703596 and 856703605.

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, 421007 + ... + 423036.

It is an arithmetic number, because the mean of its divisors is an integer number (75963960).

Almost surely, 2^856703645 is an apocalyptic number.

It is an amenable number.

856703645 is a deficient number, since it is larger than the sum of its proper divisors (358719715).

856703645 is a wasteful number, since it uses less digits than its factorization.

856703645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 844084.

The product of its (nonzero) digits is 604800, while the sum is 44.

The square root of 856703645 is about 29269.5002519688. The cubic root of 856703645 is about 949.7519740322.

The spelling of 856703645 in words is "eight hundred fifty-six million, seven hundred three thousand, six hundred forty-five".