51328290 has 32 divisors (see below), whose sum is σ = 132664896. Its totient is φ = 12634560.

The previous prime is 51328261. The next prime is 51328307. The reversal of 51328290 is 9282315.

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 15 ways as a sum of consecutive naturals, for example, 65416 + ... + 66195.

It is an arithmetic number, because the mean of its divisors is an integer number (4145778).

Almost surely, 2^51328290 is an apocalyptic number.

51328290 is an abundant number, since it is smaller than the sum of its proper divisors (81336606).

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

51328290 is a wasteful number, since it uses less digits than its factorization.

51328290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131634.

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

The square root of 51328290 is about 7164.3764557706. The cubic root of 51328290 is about 371.6369883421.

The spelling of 51328290 in words is "fifty-one million, three hundred twenty-eight thousand, two hundred ninety".