51128990 has 16 divisors (see below), whose sum is σ = 100398960. Its totient is φ = 18592320.

The previous prime is 51128971. The next prime is 51128999. The reversal of 51128990 is 9982115.

It is a super-2 number, since 2×51128990² = 5228347236840200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51128990.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51128999) 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, 232295 + ... + 232514.

It is an arithmetic number, because the mean of its divisors is an integer number (6274935).

Almost surely, 2^51128990 is an apocalyptic number.

51128990 is a deficient number, since it is larger than the sum of its proper divisors (49269970).

51128990 is a wasteful number, since it uses less digits than its factorization.

51128990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 464827.

The product of its (nonzero) digits is 6480, while the sum is 35.

The square root of 51128990 is about 7150.4538317508. The cubic root of 51128990 is about 371.1553610037.

The spelling of 51128990 in words is "fifty-one million, one hundred twenty-eight thousand, nine hundred ninety".