51128388 has 24 divisors (see below), whose sum is σ = 132555360. Its totient is φ = 17042760.

The previous prime is 51128381. The next prime is 51128447. The reversal of 51128388 is 88382115.

It is a super-2 number, since 2×51128388² = 5228224118957088, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (51128381) 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, 236598 + ... + 236813.

It is an arithmetic number, because the mean of its divisors is an integer number (5523140).

Almost surely, 2^51128388 is an apocalyptic number.

It is an amenable number.

51128388 is an abundant number, since it is smaller than the sum of its proper divisors (81426972).

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

51128388 is a wasteful number, since it uses less digits than its factorization.

51128388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473424 (or 473416 counting only the distinct ones).

The product of its digits is 15360, while the sum is 36.

The square root of 51128388 is about 7150.4117363967. The cubic root of 51128388 is about 371.1539043193.

The spelling of 51128388 in words is "fifty-one million, one hundred twenty-eight thousand, three hundred eighty-eight".