690438256 has 40 divisors (see below), whose sum is σ = 1350694800. Its totient is φ = 341890560.

The previous prime is 690438233. The next prime is 690438269. The reversal of 690438256 is 652834096.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 1213140 + ... + 1213708.

It is an arithmetic number, because the mean of its divisors is an integer number (33767370).

Almost surely, 2^690438256 is an apocalyptic number.

It is an amenable number.

690438256 is a deficient number, since it is larger than the sum of its proper divisors (660256544).

690438256 is a wasteful number, since it uses less digits than its factorization.

690438256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1177 (or 1171 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 43.

The square root of 690438256 is about 26276.1918093167. The cubic root of 690438256 is about 883.8426383286.

The spelling of 690438256 in words is "six hundred ninety million, four hundred thirty-eight thousand, two hundred fifty-six".