857616636 has 24 divisors (see below), whose sum is σ = 2055190480. Its totient is φ = 278145792.

The previous prime is 857616619. The next prime is 857616637. The reversal of 857616636 is 636616758.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (857616637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 965341 + ... + 966228.

Almost surely, 2^857616636 is an apocalyptic number.

It is an amenable number.

857616636 is an abundant number, since it is smaller than the sum of its proper divisors (1197573844).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

857616636 is a wasteful number, since it uses less digits than its factorization.

857616636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1931613 (or 1931611 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 48.

The square root of 857616636 is about 29285.0923850344. The cubic root of 857616636 is about 950.0892385238.

The spelling of 857616636 in words is "eight hundred fifty-seven million, six hundred sixteen thousand, six hundred thirty-six".