690809432 has 8 divisors (see below), whose sum is σ = 1295267700. Its totient is φ = 345404712.

The previous prime is 690809411. The next prime is 690809477. The reversal of 690809432 is 234908096.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 690809432.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43175582 + ... + 43175597.

Almost surely, 2^690809432 is an apocalyptic number.

It is an amenable number.

690809432 is a deficient number, since it is larger than the sum of its proper divisors (604458268).

690809432 is a wasteful number, since it uses less digits than its factorization.

690809432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86351185 (or 86351181 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 690809432 is about 26283.2538320506. The cubic root of 690809432 is about 884.0009930170. Note that the first 3 decimals are identical.

The spelling of 690809432 in words is "six hundred ninety million, eight hundred nine thousand, four hundred thirty-two".