2564512720 has 120 divisors (see below), whose sum is σ = 7490270592. Its totient is φ = 799307520.

The previous prime is 2564512697. The next prime is 2564512721. The reversal of 2564512720 is 272154652.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2564512721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 48837 + ... + 86683.

Almost surely, 2^2564512720 is an apocalyptic number.

2564512720 is a gapful number since it is divisible by the number (20) 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 2564512720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3745135296).

2564512720 is an abundant number, since it is smaller than the sum of its proper divisors (4925757872).

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

2564512720 is a wasteful number, since it uses less digits than its factorization.

2564512720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37889 (or 37872 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 34.

The square root of 2564512720 is about 50641.0181572211. The cubic root of 2564512720 is about 1368.7841024287.

The spelling of 2564512720 in words is "two billion, five hundred sixty-four million, five hundred twelve thousand, seven hundred twenty".