215742870 has 48 divisors (see below), whose sum is σ = 641066400. Its totient is φ = 49312512.

The previous prime is 215742851. The next prime is 215742887. The reversal of 215742870 is 78247512.

215742870 is a `hidden beast` number, since 2 + 1 + 574 + 2 + 87 + 0 = 666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 170595 + ... + 171854.

It is an arithmetic number, because the mean of its divisors is an integer number (13355550).

Almost surely, 2^215742870 is an apocalyptic number.

215742870 is an abundant number, since it is smaller than the sum of its proper divisors (425323530).

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

215742870 is a wasteful number, since it uses less digits than its factorization.

215742870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342469 (or 342466 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 36.

The square root of 215742870 is about 14688.1881115405. The cubic root of 215742870 is about 599.7618221313.

It can be divided in two parts, 215742 and 870, that added together give a palindrome (216612).

The spelling of 215742870 in words is "two hundred fifteen million, seven hundred forty-two thousand, eight hundred seventy".