693689640 has 64 divisors (see below), whose sum is σ = 2378367360. Its totient is φ = 158557440.

The previous prime is 693689629. The next prime is 693689651. The reversal of 693689640 is 46986396.

It is an interprime number because it is at equal distance from previous prime (693689629) and next prime (693689651).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 412071 + ... + 413750.

It is an arithmetic number, because the mean of its divisors is an integer number (37161990).

Almost surely, 2^693689640 is an apocalyptic number.

693689640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

693689640 is an abundant number, since it is smaller than the sum of its proper divisors (1684677720).

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

693689640 is a wasteful number, since it uses less digits than its factorization.

693689640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 825842 (or 825838 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 51.

The square root of 693689640 is about 26337.9885336751. The cubic root of 693689640 is about 885.2278515753.

The spelling of 693689640 in words is "six hundred ninety-three million, six hundred eighty-nine thousand, six hundred forty".