51819756 has 48 divisors (see below), whose sum is σ = 124561920. Its totient is φ = 16758720.

The previous prime is 51819749. The next prime is 51819797. The reversal of 51819756 is 65791815.

It is a super-2 number, since 2×51819756² = 5370574223799072, which contains 22 as substring.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

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, 78066 + ... + 78726.

It is an arithmetic number, because the mean of its divisors is an integer number (2595040).

Almost surely, 2^51819756 is an apocalyptic number.

It is an amenable number.

51819756 is an abundant number, since it is smaller than the sum of its proper divisors (72742164).

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

51819756 is a wasteful number, since it uses less digits than its factorization.

51819756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 854 (or 852 counting only the distinct ones).

The product of its digits is 75600, while the sum is 42.

The square root of 51819756 is about 7198.5940293921. The cubic root of 51819756 is about 372.8193582726.

The spelling of 51819756 in words is "fifty-one million, eight hundred nineteen thousand, seven hundred fifty-six".