857622641 has 4 divisors (see below), whose sum is σ = 857774400. Its totient is φ = 857470884.

The previous prime is 857622637. The next prime is 857622671. The reversal of 857622641 is 146226758.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 857622641 - 2² = 857622637 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (857622611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67061 + ... + 78818.

It is an arithmetic number, because the mean of its divisors is an integer number (214443600).

Almost surely, 2^857622641 is an apocalyptic number.

It is an amenable number.

857622641 is a deficient number, since it is larger than the sum of its proper divisors (151759).

857622641 is a wasteful number, since it uses less digits than its factorization.

857622641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151758.

The product of its digits is 161280, while the sum is 41.

The square root of 857622641 is about 29285.1949114224. The cubic root of 857622641 is about 950.0914560152.

The spelling of 857622641 in words is "eight hundred fifty-seven million, six hundred twenty-two thousand, six hundred forty-one".