856687013 has 16 divisors (see below), whose sum is σ = 1063727616. Its totient is φ = 671811840.

The previous prime is 856686983. The next prime is 856687093. The reversal of 856687013 is 310786658.

It is not a de Polignac number, because 856687013 - 2¹² = 856682917 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856687093) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31373 + ... + 51938.

It is an arithmetic number, because the mean of its divisors is an integer number (66482976).

Almost surely, 2^856687013 is an apocalyptic number.

It is an amenable number.

856687013 is a deficient number, since it is larger than the sum of its proper divisors (207040603).

856687013 is a wasteful number, since it uses less digits than its factorization.

856687013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83444.

The product of its (nonzero) digits is 241920, while the sum is 44.

The square root of 856687013 is about 29269.2161323121. The cubic root of 856687013 is about 949.7458278473.

The spelling of 856687013 in words is "eight hundred fifty-six million, six hundred eighty-seven thousand, thirteen".