51155880 has 64 divisors (see below), whose sum is σ = 154915200. Its totient is φ = 13512960.

The previous prime is 51155851. The next prime is 51155903. The reversal of 51155880 is 8855115.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11125 + ... + 15035.

It is an arithmetic number, because the mean of its divisors is an integer number (2420550).

Almost surely, 2^51155880 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51155880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77457600).

51155880 is an abundant number, since it is smaller than the sum of its proper divisors (103759320).

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

51155880 is a wasteful number, since it uses less digits than its factorization.

51155880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4034 (or 4030 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 33.

The square root of 51155880 is about 7152.3338848239. Note that the first 3 decimals coincide. The cubic root of 51155880 is about 371.2204161940.

The spelling of 51155880 in words is "fifty-one million, one hundred fifty-five thousand, eight hundred eighty".