51530256 has 50 divisors (see below), whose sum is σ = 149147262. Its totient is φ = 17176320.

The previous prime is 51530251. The next prime is 51530263. The reversal of 51530256 is 65203515.

It can be written as a sum of positive squares in only one way, i.e., 33177600 + 18352656 = 5760^2 + 4284^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (51530251) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 18585 + ... + 21176.

Almost surely, 2^51530256 is an apocalyptic number.

It is an amenable number.

51530256 is an abundant number, since it is smaller than the sum of its proper divisors (97617006).

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

51530256 is a wasteful number, since it uses less digits than its factorization.

51530256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39781 (or 39766 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 27.

The square root of 51530256 is about 7178.4577730875. The cubic root of 51530256 is about 372.1237881476.

The spelling of 51530256 in words is "fifty-one million, five hundred thirty thousand, two hundred fifty-six".