856987625 has 16 divisors (see below), whose sum is σ = 1151793552. Its totient is φ = 632851200.

The previous prime is 856987603. The next prime is 856987639. The reversal of 856987625 is 526789658.

It can be written as a sum of positive squares in 8 ways, for example, as 737828569 + 119159056 = 27163^2 + 10916^2 .

It is not a de Polignac number, because 856987625 - 2¹⁶ = 856922089 is a prime.

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, 262064 + ... + 265313.

It is an arithmetic number, because the mean of its divisors is an integer number (71987097).

Almost surely, 2^856987625 is an apocalyptic number.

It is an amenable number.

856987625 is a deficient number, since it is larger than the sum of its proper divisors (294805927).

856987625 is a wasteful number, since it uses less digits than its factorization.

856987625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 527405 (or 527395 counting only the distinct ones).

The product of its digits is 7257600, while the sum is 56.

The square root of 856987625 is about 29274.3509748722. The cubic root of 856987625 is about 949.8569036546.

The spelling of 856987625 in words is "eight hundred fifty-six million, nine hundred eighty-seven thousand, six hundred twenty-five".