857944428580 has 12 divisors (see below), whose sum is σ = 1801683300060. Its totient is φ = 343177771424.

The previous prime is 857944428563. The next prime is 857944428641. The reversal of 857944428580 is 85824449758.

It can be written as a sum of positive squares in 2 ways, for example, as 571790044224 + 286154384356 = 756168^2 + 534934^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21448610695 + ... + 21448610734.

It is an arithmetic number, because the mean of its divisors is an integer number (150140275005).

Almost surely, 2^857944428580 is an apocalyptic number.

It is an amenable number.

857944428580 is an abundant number, since it is smaller than the sum of its proper divisors (943738871480).

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

857944428580 is a wasteful number, since it uses less digits than its factorization.

857944428580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42897221438 (or 42897221436 counting only the distinct ones).

The product of its (nonzero) digits is 103219200, while the sum is 64.

The spelling of 857944428580 in words is "eight hundred fifty-seven billion, nine hundred forty-four million, four hundred twenty-eight thousand, five hundred eighty".