51522768 has 90 divisors (see below), whose sum is σ = 158545842. Its totient is φ = 15607680.

The previous prime is 51522739. The next prime is 51522781. The reversal of 51522768 is 86722515.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 36869184 + 14653584 = 6072^2 + 3828^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 15946 + ... + 18902.

Almost surely, 2^51522768 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 51522768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79272921).

51522768 is an abundant number, since it is smaller than the sum of its proper divisors (107023074).

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

51522768 is a wasteful number, since it uses less digits than its factorization.

51522768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2993 (or 2973 counting only the distinct ones).

The product of its digits is 33600, while the sum is 36.

The square root of 51522768 is about 7177.9361936423. The cubic root of 51522768 is about 372.1057625052.

The spelling of 51522768 in words is "fifty-one million, five hundred twenty-two thousand, seven hundred sixty-eight".