51978256 has 40 divisors (see below), whose sum is σ = 110359008. Its totient is φ = 23520000.

The previous prime is 51978247. The next prime is 51978257. The reversal of 51978256 is 65287915.

It is not an unprimeable number, because it can be changed into a prime (51978257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48931 + ... + 49981.

Almost surely, 2^51978256 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51978256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55179504).

51978256 is an abundant number, since it is smaller than the sum of its proper divisors (58380752).

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

51978256 is a wasteful number, since it uses less digits than its factorization.

51978256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1351 (or 1345 counting only the distinct ones).

The product of its digits is 151200, while the sum is 43.

The square root of 51978256 is about 7209.5947181516. The cubic root of 51978256 is about 373.1990829653.

The spelling of 51978256 in words is "fifty-one million, nine hundred seventy-eight thousand, two hundred fifty-six".