2528388621 has 32 divisors (see below), whose sum is σ = 4089191040. Its totient is φ = 1531267200.

The previous prime is 2528388607. The next prime is 2528388623. The reversal of 2528388621 is 1268838252.

It is not a de Polignac number, because 2528388621 - 2¹⁵ = 2528355853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2528388623) 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, 657721 + ... + 661553.

It is an arithmetic number, because the mean of its divisors is an integer number (127787220).

Almost surely, 2^2528388621 is an apocalyptic number.

It is an amenable number.

2528388621 is a deficient number, since it is larger than the sum of its proper divisors (1560802419).

2528388621 is a wasteful number, since it uses less digits than its factorization.

2528388621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6074 (or 6068 counting only the distinct ones).

The product of its digits is 368640, while the sum is 45.

The square root of 2528388621 is about 50283.0848397351. The cubic root of 2528388621 is about 1362.3267230307.

The spelling of 2528388621 in words is "two billion, five hundred twenty-eight million, three hundred eighty-eight thousand, six hundred twenty-one".