51281328 has 40 divisors (see below), whose sum is σ = 151403008. Its totient is φ = 14651712.

The previous prime is 51281317. The next prime is 51281357. The reversal of 51281328 is 82318215.

It is a junction number, because it is equal to n+sod(n) for n = 51281295 and 51281304.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75976 + ... + 76647.

Almost surely, 2^51281328 is an apocalyptic number.

It is an amenable number.

51281328 is an abundant number, since it is smaller than the sum of its proper divisors (100121680).

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

51281328 is a wasteful number, since it uses less digits than its factorization.

51281328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152641 (or 152635 counting only the distinct ones).

The product of its digits is 3840, while the sum is 30.

The square root of 51281328 is about 7161.0982397953. The cubic root of 51281328 is about 371.5236126469.

The spelling of 51281328 in words is "fifty-one million, two hundred eighty-one thousand, three hundred twenty-eight".