870019857 has 48 divisors (see below), whose sum is σ = 1485544320. Its totient is φ = 480370176.

The previous prime is 870019853. The next prime is 870019901. The reversal of 870019857 is 758910078.

It is not a de Polignac number, because 870019857 - 2² = 870019853 is a prime.

It is not an unprimeable number, because it can be changed into a prime (870019853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 221769 + ... + 225657.

It is an arithmetic number, because the mean of its divisors is an integer number (30948840).

Almost surely, 2^870019857 is an apocalyptic number.

It is an amenable number.

870019857 is a deficient number, since it is larger than the sum of its proper divisors (615524463).

870019857 is a wasteful number, since it uses less digits than its factorization.

870019857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4022 (or 4019 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 45.

The square root of 870019857 is about 29496.0990132594. The cubic root of 870019857 is about 954.6475338278.

The spelling of 870019857 in words is "eight hundred seventy million, nineteen thousand, eight hundred fifty-seven".