51393128 has 8 divisors (see below), whose sum is σ = 96362130. Its totient is φ = 25696560.

The previous prime is 51393113. The next prime is 51393161. The reversal of 51393128 is 82139315.

It can be written as a sum of positive squares in only one way, i.e., 50098084 + 1295044 = 7078^2 + 1138^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 51393094 and 51393103.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3212063 + ... + 3212078.

Almost surely, 2^51393128 is an apocalyptic number.

It is an amenable number.

51393128 is a deficient number, since it is larger than the sum of its proper divisors (44969002).

51393128 is a wasteful number, since it uses less digits than its factorization.

51393128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6424147 (or 6424143 counting only the distinct ones).

The product of its digits is 6480, while the sum is 32.

The square root of 51393128 is about 7168.9000550991. The cubic root of 51393128 is about 371.7934066970.

The spelling of 51393128 in words is "fifty-one million, three hundred ninety-three thousand, one hundred twenty-eight".