51506056 has 96 divisors (see below), whose sum is σ = 121888800. Its totient is φ = 20267520.

The previous prime is 51506053. The next prime is 51506057. The reversal of 51506056 is 65060515.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (51506051) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 393111 + ... + 393241.

It is an arithmetic number, because the mean of its divisors is an integer number (1269675).

Almost surely, 2^51506056 is an apocalyptic number.

51506056 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 51506056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60944400).

51506056 is an abundant number, since it is smaller than the sum of its proper divisors (70382744).

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

51506056 is a wasteful number, since it uses less digits than its factorization.

51506056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227 (or 216 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 28.

The square root of 51506056 is about 7176.7719763136. The cubic root of 51506056 is about 372.0655258990.

The spelling of 51506056 in words is "fifty-one million, five hundred six thousand, fifty-six".