690156564 has 12 divisors (see below), whose sum is σ = 1610365344. Its totient is φ = 230052184.

The previous prime is 690156563. The next prime is 690156611. The reversal of 690156564 is 465651096.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690156563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28756512 + ... + 28756535.

It is an arithmetic number, because the mean of its divisors is an integer number (134197112).

Almost surely, 2^690156564 is an apocalyptic number.

It is an amenable number.

690156564 is an abundant number, since it is smaller than the sum of its proper divisors (920208780).

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

690156564 is a wasteful number, since it uses less digits than its factorization.

690156564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57513054 (or 57513052 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 42.

The square root of 690156564 is about 26270.8310489029. The cubic root of 690156564 is about 883.7224222846.

The spelling of 690156564 in words is "six hundred ninety million, one hundred fifty-six thousand, five hundred sixty-four".