51164988 has 24 divisors (see below), whose sum is σ = 136440192. Its totient is φ = 14618544.

The previous prime is 51164957. The next prime is 51164989. The reversal of 51164988 is 88946115.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51164989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 304470 + ... + 304637.

It is an arithmetic number, because the mean of its divisors is an integer number (5685008).

Almost surely, 2^51164988 is an apocalyptic number.

It is an amenable number.

51164988 is an abundant number, since it is smaller than the sum of its proper divisors (85275204).

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

51164988 is a wasteful number, since it uses less digits than its factorization.

51164988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 609121 (or 609119 counting only the distinct ones).

The product of its digits is 69120, while the sum is 42.

The square root of 51164988 is about 7152.9705717275. The cubic root of 51164988 is about 371.2424460819.

The spelling of 51164988 in words is "fifty-one million, one hundred sixty-four thousand, nine hundred eighty-eight".