51812772 has 96 divisors (see below), whose sum is σ = 141227520. Its totient is φ = 14618880.

The previous prime is 51812771. The next prime is 51812777. The reversal of 51812772 is 27721815.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (51812771) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 182943 + ... + 183225.

It is an arithmetic number, because the mean of its divisors is an integer number (1471120).

Almost surely, 2^51812772 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 51812772, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70613760).

51812772 is an abundant number, since it is smaller than the sum of its proper divisors (89414748).

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

51812772 is a wasteful number, since it uses less digits than its factorization.

51812772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393 (or 391 counting only the distinct ones).

The product of its digits is 7840, while the sum is 33.

The square root of 51812772 is about 7198.1089183201. The cubic root of 51812772 is about 372.8026086287.

The spelling of 51812772 in words is "fifty-one million, eight hundred twelve thousand, seven hundred seventy-two".