2640345888 has 96 divisors (see below), whose sum is σ = 7575482880. Its totient is φ = 801607680.

The previous prime is 2640345853. The next prime is 2640345893. The reversal of 2640345888 is 8885430462.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24498 + ... + 76686.

It is an arithmetic number, because the mean of its divisors is an integer number (78911280).

Almost surely, 2^2640345888 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2640345888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3787741440).

2640345888 is an abundant number, since it is smaller than the sum of its proper divisors (4935136992).

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

2640345888 is a wasteful number, since it uses less digits than its factorization.

2640345888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52250 (or 52242 counting only the distinct ones).

The product of its (nonzero) digits is 1474560, while the sum is 48.

The square root of 2640345888 is about 51384.2961224536. The cubic root of 2640345888 is about 1382.1450027722.

The spelling of 2640345888 in words is "two billion, six hundred forty million, three hundred forty-five thousand, eight hundred eighty-eight".