51188778 has 24 divisors (see below), whose sum is σ = 113003748. Its totient is φ = 16740672.

The previous prime is 51188729. The next prime is 51188789. The reversal of 51188778 is 87788115.

It can be written as a sum of positive squares in 2 ways, for example, as 48066489 + 3122289 = 6933^2 + 1767^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25875 + ... + 27782.

Almost surely, 2^51188778 is an apocalyptic number.

51188778 is an abundant number, since it is smaller than the sum of its proper divisors (61814970).

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

51188778 is a wasteful number, since it uses less digits than its factorization.

51188778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53718 (or 53715 counting only the distinct ones).

The product of its digits is 125440, while the sum is 45.

The square root of 51188778 is about 7154.6333239377. The cubic root of 51188778 is about 371.2999755870.

The spelling of 51188778 in words is "fifty-one million, one hundred eighty-eight thousand, seven hundred seventy-eight".