2645657872 has 80 divisors (see below), whose sum is σ = 6034488768. Its totient is φ = 1107786240.

The previous prime is 2645657867. The next prime is 2645657873. The reversal of 2645657872 is 2787565462.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is not an unprimeable number, because it can be changed into a prime (2645657873) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1561858 + ... + 1563550.

Almost surely, 2^2645657872 is an apocalyptic number.

2645657872 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2645657872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3017244384).

2645657872 is an abundant number, since it is smaller than the sum of its proper divisors (3388830896).

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

2645657872 is a wasteful number, since it uses less digits than its factorization.

2645657872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2408 (or 2402 counting only the distinct ones).

The product of its digits is 5644800, while the sum is 52.

The square root of 2645657872 is about 51435.9589392479. The cubic root of 2645657872 is about 1383.0712720719.

The spelling of 2645657872 in words is "two billion, six hundred forty-five million, six hundred fifty-seven thousand, eight hundred seventy-two".