2645136648 has 384 divisors, whose sum is σ = 9510359040. Its totient is φ = 668736000.

The previous prime is 2645136629. The next prime is 2645136649. The reversal of 2645136648 is 8466315462.

It is not an unprimeable number, because it can be changed into a prime (2645136649) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 6136993 + ... + 6137423.

It is an arithmetic number, because the mean of its divisors is an integer number (24766560).

Almost surely, 2^2645136648 is an apocalyptic number.

2645136648 is a gapful number since it is divisible by the number (28) 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 2645136648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4755179520).

2645136648 is an abundant number, since it is smaller than the sum of its proper divisors (6865222392).

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

2645136648 is a wasteful number, since it uses less digits than its factorization.

2645136648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511 (or 495 counting only the distinct ones).

The product of its digits is 829440, while the sum is 45.

The square root of 2645136648 is about 51430.8919619328. The cubic root of 2645136648 is about 1382.9804393034.

The spelling of 2645136648 in words is "two billion, six hundred forty-five million, one hundred thirty-six thousand, six hundred forty-eight".