51232128 has 32 divisors (see below), whose sum is σ = 136086360. Its totient is φ = 17077248.

The previous prime is 51232091. The next prime is 51232133. The reversal of 51232128 is 82123215.

It is a tau number, because it is divible by the number of its divisors (32).

It is a hoax number, since the sum of its digits (24) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a junction number, because it is equal to n+sod(n) for n = 51232098 and 51232107.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66325 + ... + 67092.

Almost surely, 2^51232128 is an apocalyptic number.

It is an amenable number.

51232128 is an abundant number, since it is smaller than the sum of its proper divisors (84854232).

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

51232128 is a wasteful number, since it uses less digits than its factorization.

51232128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133434 (or 133422 counting only the distinct ones).

The product of its digits is 960, while the sum is 24.

The square root of 51232128 is about 7157.6621881729. The cubic root of 51232128 is about 371.4047597020.

It can be divided in two parts, 51232 and 128, that added together give a triangular number (51360 = T₃₂₀).

The spelling of 51232128 in words is "fifty-one million, two hundred thirty-two thousand, one hundred twenty-eight".