693661388 has 12 divisors (see below), whose sum is σ = 1387322832. Its totient is φ = 297283440.

The previous prime is 693661373. The next prime is 693661399. The reversal of 693661388 is 883166396.

693661388 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

693661388 is an admirable number.

It is a super-2 number, since 2×693661388² = 962332242404173088, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12386783 + ... + 12386838.

It is an arithmetic number, because the mean of its divisors is an integer number (115610236).

Almost surely, 2^693661388 is an apocalyptic number.

It is an amenable number.

693661388 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

693661388 is a wasteful number, since it uses less digits than its factorization.

693661388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24773632 (or 24773630 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 50.

The square root of 693661388 is about 26337.4521926476. The cubic root of 693661388 is about 885.2158338106.

The spelling of 693661388 in words is "six hundred ninety-three million, six hundred sixty-one thousand, three hundred eighty-eight".