51668456 has 48 divisors (see below), whose sum is σ = 113580000. Its totient is φ = 21585312.

The previous prime is 51668443. The next prime is 51668473. The reversal of 51668456 is 65486615.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 103295 + ... + 103793.

It is an arithmetic number, because the mean of its divisors is an integer number (2366250).

Almost surely, 2^51668456 is an apocalyptic number.

51668456 is a gapful number since it is divisible by the number (56) 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 51668456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (56790000).

51668456 is an abundant number, since it is smaller than the sum of its proper divisors (61911544).

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

51668456 is a wasteful number, since it uses less digits than its factorization.

51668456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 598 (or 551 counting only the distinct ones).

The product of its digits is 172800, while the sum is 41.

The square root of 51668456 is about 7188.0773507246. The cubic root of 51668456 is about 372.4561598782.

The spelling of 51668456 in words is "fifty-one million, six hundred sixty-eight thousand, four hundred fifty-six".