2640787884 has 72 divisors (see below), whose sum is σ = 8030480640. Its totient is φ = 714798432.

The previous prime is 2640787883. The next prime is 2640787889. The reversal of 2640787884 is 4887870462.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 2640787884.

It is not an unprimeable number, because it can be changed into a prime (2640787883) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 270984 + ... + 280559.

Almost surely, 2^2640787884 is an apocalyptic number.

It is an amenable number.

2640787884 is an abundant number, since it is smaller than the sum of its proper divisors (5389692756).

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

2640787884 is a wasteful number, since it uses less digits than its factorization.

2640787884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 551579 (or 551574 counting only the distinct ones).

The product of its (nonzero) digits is 4816896, while the sum is 54.

The square root of 2640787884 is about 51388.5968284794. The cubic root of 2640787884 is about 1382.2221225263. Note that the first 3 decimals are identical.

The spelling of 2640787884 in words is "two billion, six hundred forty million, seven hundred eighty-seven thousand, eight hundred eighty-four".