51561672 has 16 divisors (see below), whose sum is σ = 128904240. Its totient is φ = 17187216.

The previous prime is 51561637. The next prime is 51561673. The reversal of 51561672 is 27616515.

It is not an unprimeable number, because it can be changed into a prime (51561673) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1074178 + ... + 1074225.

It is an arithmetic number, because the mean of its divisors is an integer number (8056515).

Almost surely, 2^51561672 is an apocalyptic number.

It is an amenable number.

51561672 is an abundant number, since it is smaller than the sum of its proper divisors (77342568).

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

51561672 is a wasteful number, since it uses less digits than its factorization.

51561672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2148412 (or 2148408 counting only the distinct ones).

The product of its digits is 12600, while the sum is 33.

The square root of 51561672 is about 7180.6456534214. The cubic root of 51561672 is about 372.1993959353.

The spelling of 51561672 in words is "fifty-one million, five hundred sixty-one thousand, six hundred seventy-two".