1044646640 has 20 divisors (see below), whose sum is σ = 2428803624. Its totient is φ = 417858624.

The previous prime is 1044646633. The next prime is 1044646697. The reversal of 1044646640 is 466464401.

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

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1044646640.

It is a congruent number.

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, 6528962 + ... + 6529121.

Almost surely, 2^1044646640 is an apocalyptic number.

1044646640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1044646640 is an abundant number, since it is smaller than the sum of its proper divisors (1384156984).

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

1044646640 is a wasteful number, since it uses less digits than its factorization.

1044646640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13058096 (or 13058090 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 35.

The square root of 1044646640 is about 32320.9937966022. The cubic root of 1044646640 is about 1014.6660682498. Note that the first 3 decimals are identical.

The spelling of 1044646640 in words is "one billion, forty-four million, six hundred forty-six thousand, six hundred forty".