51455978 has 24 divisors (see below), whose sum is σ = 90727812. Its totient is φ = 21821184.

The previous prime is 51455959. The next prime is 51455981. The reversal of 51455978 is 87955415.

51455978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 49885969 + 1570009 = 7063^2 + 1253^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6800 + ... + 12212.

Almost surely, 2^51455978 is an apocalyptic number.

51455978 is a deficient number, since it is larger than the sum of its proper divisors (39271834).

51455978 is a wasteful number, since it uses less digits than its factorization.

51455978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5526 (or 5519 counting only the distinct ones).

The product of its digits is 252000, while the sum is 44.

The square root of 51455978 is about 7173.2822333992. The cubic root of 51455978 is about 371.9449035833.

The spelling of 51455978 in words is "fifty-one million, four hundred fifty-five thousand, nine hundred seventy-eight".