690564856 has 8 divisors (see below), whose sum is σ = 1294809120. Its totient is φ = 345282424.

The previous prime is 690564841. The next prime is 690564863. The reversal of 690564856 is 658465096.

It is a happy number.

690564856 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a super-3 number, since 3×690564856³ (a number of 27 digits) contains 333 as substring.

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, 43160296 + ... + 43160311.

It is an arithmetic number, because the mean of its divisors is an integer number (161851140).

Almost surely, 2^690564856 is an apocalyptic number.

It is an amenable number.

690564856 is a deficient number, since it is larger than the sum of its proper divisors (604244264).

690564856 is a wasteful number, since it uses less digits than its factorization.

690564856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86320613 (or 86320609 counting only the distinct ones).

The product of its (nonzero) digits is 1555200, while the sum is 49.

The square root of 690564856 is about 26278.6007237828. The cubic root of 690564856 is about 883.8966560189.

The spelling of 690564856 in words is "six hundred ninety million, five hundred sixty-four thousand, eight hundred fifty-six".