69138888 has 64 divisors (see below), whose sum is σ = 212741760. Its totient is φ = 18233856.

The previous prime is 69138887. The next prime is 69138899. The reversal of 69138888 is 88883196.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 69138888.

It is not an unprimeable number, because it can be changed into a prime (69138887) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13645 + ... + 18012.

It is an arithmetic number, because the mean of its divisors is an integer number (3324090).

Almost surely, 2^69138888 is an apocalyptic number.

It is an amenable number.

69138888 is an abundant number, since it is smaller than the sum of its proper divisors (143602872).

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

69138888 is a wasteful number, since it uses less digits than its factorization.

69138888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31686 (or 31682 counting only the distinct ones).

The product of its digits is 663552, while the sum is 51.

The square root of 69138888 is about 8314.9797353932. The cubic root of 69138888 is about 410.4316057720.

The spelling of 69138888 in words is "sixty-nine million, one hundred thirty-eight thousand, eight hundred eighty-eight".