2645921388 has 96 divisors (see below), whose sum is σ = 7003277568. Its totient is φ = 770457600.

The previous prime is 2645921387. The next prime is 2645921419. The reversal of 2645921388 is 8831295462.

It is not an unprimeable number, because it can be changed into a prime (2645921387) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 358956 + ... + 366252.

It is an arithmetic number, because the mean of its divisors is an integer number (72950808).

Almost surely, 2^2645921388 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 2645921388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3501638784).

2645921388 is an abundant number, since it is smaller than the sum of its proper divisors (4357356180).

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

2645921388 is a wasteful number, since it uses less digits than its factorization.

2645921388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7423 (or 7421 counting only the distinct ones).

The product of its digits is 829440, while the sum is 48.

The square root of 2645921388 is about 51438.5204686138. The cubic root of 2645921388 is about 1383.1171899907.

The spelling of 2645921388 in words is "two billion, six hundred forty-five million, nine hundred twenty-one thousand, three hundred eighty-eight".