2521767878 has 32 divisors (see below), whose sum is σ = 4411091520. Its totient is φ = 1058803200.

The previous prime is 2521767869. The next prime is 2521767883. The reversal of 2521767878 is 8787671252.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 598178 + ... + 602378.

It is an arithmetic number, because the mean of its divisors is an integer number (137846610).

Almost surely, 2^2521767878 is an apocalyptic number.

2521767878 is a deficient number, since it is larger than the sum of its proper divisors (1889323642).

2521767878 is a wasteful number, since it uses less digits than its factorization.

2521767878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5072.

The product of its digits is 2634240, while the sum is 53.

The square root of 2521767878 is about 50217.2069912296. The cubic root of 2521767878 is about 1361.1365711527.

The spelling of 2521767878 in words is "two billion, five hundred twenty-one million, seven hundred sixty-seven thousand, eight hundred seventy-eight".