51566772 has 24 divisors (see below), whose sum is σ = 120459136. Its totient is φ = 17169408.

The previous prime is 51566771. The next prime is 51566773. The reversal of 51566772 is 27766515.

It is an interprime number because it is at equal distance from previous prime (51566771) and next prime (51566773).

It is a self number, because there is not a number n which added to its sum of digits gives 51566772.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51566771) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11973 + ... + 15699.

Almost surely, 2^51566772 is an apocalyptic number.

It is an amenable number.

51566772 is an abundant number, since it is smaller than the sum of its proper divisors (68892364).

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

51566772 is a wasteful number, since it uses less digits than its factorization.

51566772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4887 (or 4885 counting only the distinct ones).

The product of its digits is 88200, while the sum is 39.

The square root of 51566772 is about 7181.0007659100. Note that the first 3 decimals coincide. The cubic root of 51566772 is about 372.2116670291.

The spelling of 51566772 in words is "fifty-one million, five hundred sixty-six thousand, seven hundred seventy-two".