868990642 has 16 divisors (see below), whose sum is σ = 1414812672. Its totient is φ = 397913040.

The previous prime is 868990627. The next prime is 868990657. The reversal of 868990642 is 246099868.

It is an interprime number because it is at equal distance from previous prime (868990627) and next prime (868990657).

It is a self number, because there is not a number n which added to its sum of digits gives 868990642.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 128284 + ... + 134887.

It is an arithmetic number, because the mean of its divisors is an integer number (88425792).

Almost surely, 2^868990642 is an apocalyptic number.

868990642 is a deficient number, since it is larger than the sum of its proper divisors (545822030).

868990642 is a wasteful number, since it uses less digits than its factorization.

868990642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263313.

The product of its (nonzero) digits is 1492992, while the sum is 52.

The square root of 868990642 is about 29478.6472213363. The cubic root of 868990642 is about 954.2709427080.

The spelling of 868990642 in words is "eight hundred sixty-eight million, nine hundred ninety thousand, six hundred forty-two".