1690639264 has 24 divisors (see below), whose sum is σ = 3409630308. Its totient is φ = 824701440.

The previous prime is 1690639241. The next prime is 1690639333. The reversal of 1690639264 is 4629360961.

It can be written as a sum of positive squares in 2 ways, for example, as 1553936400 + 136702864 = 39420^2 + 11692^2 .

It is a super-2 number, since 2×1690639264² = 5716522241956923392, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 642987 + ... + 645610.

Almost surely, 2^1690639264 is an apocalyptic number.

It is an amenable number.

1690639264 is an abundant number, since it is smaller than the sum of its proper divisors (1718991044).

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

1690639264 is a wasteful number, since it uses less digits than its factorization.

1690639264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1288648 (or 1288640 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 46.

The square root of 1690639264 is about 41117.3839634771. The cubic root of 1690639264 is about 1191.2885940179.

The spelling of 1690639264 in words is "one billion, six hundred ninety million, six hundred thirty-nine thousand, two hundred sixty-four".