1640338884 has 48 divisors (see below), whose sum is σ = 4262328000. Its totient is φ = 545545728.

The previous prime is 1640338883. The next prime is 1640338907. The reversal of 1640338884 is 4888330461.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1640338883) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31579 + ... + 65405.

It is an arithmetic number, because the mean of its divisors is an integer number (88798500).

Almost surely, 2^1640338884 is an apocalyptic number.

It is an amenable number.

1640338884 is an abundant number, since it is smaller than the sum of its proper divisors (2621989116).

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

1640338884 is a wasteful number, since it uses less digits than its factorization.

1640338884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34289 (or 34281 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 45.

The square root of 1640338884 is about 40501.0973184678. The cubic root of 1640338884 is about 1179.3549294306.

The spelling of 1640338884 in words is "one billion, six hundred forty million, three hundred thirty-eight thousand, eight hundred eighty-four".