869542690 has 16 divisors (see below), whose sum is σ = 1657246392. Its totient is φ = 327357184.

The previous prime is 869542679. The next prime is 869542691. The reversal of 869542690 is 96245968.

It can be written as a sum of positive squares in 4 ways, for example, as 811737081 + 57805609 = 28491^2 + 7603^2 .

It is a super-2 number, since 2×869542690² = 1512208979464872200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (869542691) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2557309 + ... + 2557648.

Almost surely, 2^869542690 is an apocalyptic number.

869542690 is a deficient number, since it is larger than the sum of its proper divisors (787703702).

869542690 is a wasteful number, since it uses less digits than its factorization.

869542690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5114981.

The product of its (nonzero) digits is 933120, while the sum is 49.

The square root of 869542690 is about 29488.0092580018. The cubic root of 869542690 is about 954.4729747454.

The spelling of 869542690 in words is "eight hundred sixty-nine million, five hundred forty-two thousand, six hundred ninety".