51128420 has 48 divisors (see below), whose sum is σ = 123475968. Its totient is φ = 17420160.

The previous prime is 51128381. The next prime is 51128447. The reversal of 51128420 is 2482115.

It is a super-2 number, since 2×51128420² = 5228230663392800, which contains 22 as substring.

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, 23165 + ... + 25275.

It is an arithmetic number, because the mean of its divisors is an integer number (2572416).

Almost surely, 2^51128420 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 51128420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61737984).

51128420 is an abundant number, since it is smaller than the sum of its proper divisors (72347548).

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

51128420 is a wasteful number, since it uses less digits than its factorization.

51128420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2300 (or 2298 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 51128420 is about 7150.4139740298. The cubic root of 51128420 is about 371.1539817513.

The spelling of 51128420 in words is "fifty-one million, one hundred twenty-eight thousand, four hundred twenty".