857640852 has 24 divisors (see below), whose sum is σ = 2223513600. Its totient is φ = 285880248.

The previous prime is 857640851. The next prime is 857640853. The reversal of 857640852 is 258046758.

It is an interprime number because it is at equal distance from previous prime (857640851) and next prime (857640853).

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 857640798 and 857640807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (857640851) 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, 3970452 + ... + 3970667.

It is an arithmetic number, because the mean of its divisors is an integer number (92646400).

Almost surely, 2^857640852 is an apocalyptic number.

It is an amenable number.

857640852 is an abundant number, since it is smaller than the sum of its proper divisors (1365872748).

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

857640852 is a wasteful number, since it uses less digits than its factorization.

857640852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7941132 (or 7941124 counting only the distinct ones).

The product of its (nonzero) digits is 537600, while the sum is 45.

The square root of 857640852 is about 29285.5058347982. The cubic root of 857640852 is about 950.0981808039.

The spelling of 857640852 in words is "eight hundred fifty-seven million, six hundred forty thousand, eight hundred fifty-two".