51164490 has 64 divisors (see below), whose sum is σ = 133410816. Its totient is φ = 12483072.

The previous prime is 51164471. The next prime is 51164521. The reversal of 51164490 is 9446115.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 49014 + ... + 50046.

It is an arithmetic number, because the mean of its divisors is an integer number (2084544).

Almost surely, 2^51164490 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51164490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66705408).

51164490 is an abundant number, since it is smaller than the sum of its proper divisors (82246326).

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

51164490 is a wasteful number, since it uses less digits than its factorization.

51164490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1183.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 51164490 is about 7152.9357609306. The cubic root of 51164490 is about 371.2412416168.

The spelling of 51164490 in words is "fifty-one million, one hundred sixty-four thousand, four hundred ninety".