690505520 has 20 divisors (see below), whose sum is σ = 1605425520. Its totient is φ = 276202176.

The previous prime is 690505513. The next prime is 690505549. The reversal of 690505520 is 25505096.

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4315580 + ... + 4315739.

It is an arithmetic number, because the mean of its divisors is an integer number (80271276).

Almost surely, 2^690505520 is an apocalyptic number.

It is an amenable number.

690505520 is an abundant number, since it is smaller than the sum of its proper divisors (914920000).

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

690505520 is a wasteful number, since it uses less digits than its factorization.

690505520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8631332 (or 8631326 counting only the distinct ones).

The product of its (nonzero) digits is 13500, while the sum is 32.

The square root of 690505520 is about 26277.4717200875. The cubic root of 690505520 is about 883.8713393555.

The spelling of 690505520 in words is "six hundred ninety million, five hundred five thousand, five hundred twenty".