51581328 has 40 divisors (see below), whose sum is σ = 133512288. Its totient is φ = 17160192.

The previous prime is 51581323. The next prime is 51581339. The reversal of 51581328 is 82318515.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (51581323) 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, 41776 + ... + 42992.

Almost surely, 2^51581328 is an apocalyptic number.

It is an amenable number.

51581328 is an abundant number, since it is smaller than the sum of its proper divisors (81930960).

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

51581328 is a wasteful number, since it uses less digits than its factorization.

51581328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2111 (or 2105 counting only the distinct ones).

The product of its digits is 9600, while the sum is 33.

The square root of 51581328 is about 7182.0142021581. The cubic root of 51581328 is about 372.2466857250.

The spelling of 51581328 in words is "fifty-one million, five hundred eighty-one thousand, three hundred twenty-eight".