51855978 has 32 divisors (see below), whose sum is σ = 110975040. Its totient is φ = 16104960.

The previous prime is 51855943. The next prime is 51855989. The reversal of 51855978 is 87955815.

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, 3226 + ... + 10682.

It is an arithmetic number, because the mean of its divisors is an integer number (3467970).

Almost surely, 2^51855978 is an apocalyptic number.

51855978 is an abundant number, since it is smaller than the sum of its proper divisors (59119062).

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

51855978 is a wasteful number, since it uses less digits than its factorization.

51855978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7542.

The product of its digits is 504000, while the sum is 48.

The square root of 51855978 is about 7201.1094978482. The cubic root of 51855978 is about 372.9062049283.

The spelling of 51855978 in words is "fifty-one million, eight hundred fifty-five thousand, nine hundred seventy-eight".