51442866 has 12 divisors (see below), whose sum is σ = 111459582. Its totient is φ = 17147616.

The previous prime is 51442843. The next prime is 51442871. The reversal of 51442866 is 66824415.

It can be written as a sum of positive squares in only one way, i.e., 48650625 + 2792241 = 6975^2 + 1671^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 51442866.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1428951 + ... + 1428986.

Almost surely, 2^51442866 is an apocalyptic number.

51442866 is an abundant number, since it is smaller than the sum of its proper divisors (60016716).

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

51442866 is a wasteful number, since it uses less digits than its factorization.

51442866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2857945 (or 2857942 counting only the distinct ones).

The product of its digits is 46080, while the sum is 36.

The square root of 51442866 is about 7172.3682281378. The cubic root of 51442866 is about 371.9133079290.

The spelling of 51442866 in words is "fifty-one million, four hundred forty-two thousand, eight hundred sixty-six".