1816639264 has 48 divisors (see below), whose sum is σ = 3967820640. Its totient is φ = 811740160.

The previous prime is 1816639249. The next prime is 1816639271. The reversal of 1816639264 is 4629366181.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22969 + ... + 64504.

It is an arithmetic number, because the mean of its divisors is an integer number (82662930).

Almost surely, 2^1816639264 is an apocalyptic number.

It is an amenable number.

1816639264 is an abundant number, since it is smaller than the sum of its proper divisors (2151181376).

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

1816639264 is a wasteful number, since it uses less digits than its factorization.

1816639264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87553 (or 87545 counting only the distinct ones).

The product of its digits is 373248, while the sum is 46.

The square root of 1816639264 is about 42622.0513818845. The cubic root of 1816639264 is about 1220.1771811107.

The spelling of 1816639264 in words is "one billion, eight hundred sixteen million, six hundred thirty-nine thousand, two hundred sixty-four".