51256688 has 80 divisors (see below), whose sum is σ = 120468480. Its totient is φ = 20659968.

The previous prime is 51256679. The next prime is 51256691. The reversal of 51256688 is 88665215.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 139481 + ... + 139847.

It is an arithmetic number, because the mean of its divisors is an integer number (1505856).

Almost surely, 2^51256688 is an apocalyptic number.

51256688 is a gapful number since it is divisible by the number (58) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51256688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60234240).

51256688 is an abundant number, since it is smaller than the sum of its proper divisors (69211792).

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

51256688 is a wasteful number, since it uses less digits than its factorization.

51256688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454 (or 448 counting only the distinct ones).

The product of its digits is 115200, while the sum is 41.

The square root of 51256688 is about 7159.3776265818. The cubic root of 51256688 is about 371.4640990530.

The spelling of 51256688 in words is "fifty-one million, two hundred fifty-six thousand, six hundred eighty-eight".