51031328 has 12 divisors (see below), whose sum is σ = 100467990. Its totient is φ = 25515648.

The previous prime is 51031327. The next prime is 51031333. The reversal of 51031328 is 82313015.

It can be written as a sum of positive squares in only one way, i.e., 32126224 + 18905104 = 5668^2 + 4348^2 .

It is not an unprimeable number, because it can be changed into a prime (51031327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 797333 + ... + 797396.

Almost surely, 2^51031328 is an apocalyptic number.

It is an amenable number.

51031328 is a deficient number, since it is larger than the sum of its proper divisors (49436662).

51031328 is a wasteful number, since it uses less digits than its factorization.

51031328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1594739 (or 1594731 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 51031328 is about 7143.6214905327. The cubic root of 51031328 is about 370.9188945133.

The spelling of 51031328 in words is "fifty-one million, thirty-one thousand, three hundred twenty-eight".