51563268 has 18 divisors (see below), whose sum is σ = 130340574. Its totient is φ = 17187744.

The previous prime is 51563249. The next prime is 51563269. The reversal of 51563268 is 86236515.

51563268 is a `hidden beast` number, since 5 + 15 + 632 + 6 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 51151104 + 412164 = 7152^2 + 642^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 1432313 = 51563268 / (5 + 1 + 5 + 6 + 3 + 2 + 6 + 8).

It is not an unprimeable number, because it can be changed into a prime (51563269) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 716121 + ... + 716192.

It is an arithmetic number, because the mean of its divisors is an integer number (7241143).

Almost surely, 2^51563268 is an apocalyptic number.

It is an amenable number.

51563268 is an abundant number, since it is smaller than the sum of its proper divisors (78777306).

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

51563268 is a wasteful number, since it uses less digits than its factorization.

51563268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1432323 (or 1432318 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 51563268 is about 7180.7567846293. The cubic root of 51563268 is about 372.2032361528.

The spelling of 51563268 in words is "fifty-one million, five hundred sixty-three thousand, two hundred sixty-eight".