51538068 has 18 divisors (see below), whose sum is σ = 130276874. Its totient is φ = 17179344.

The previous prime is 51538063. The next prime is 51538111. The reversal of 51538068 is 86083515.

51538068 is a `hidden beast` number, since 515 + 3 + 80 + 68 = 666.

It can be written as a sum of positive squares in only one way, i.e., 46949904 + 4588164 = 6852^2 + 2142^2 .

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: 1431613 = 51538068 / (5 + 1 + 5 + 3 + 8 + 0 + 6 + 8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51538063) 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, 715771 + ... + 715842.

Almost surely, 2^51538068 is an apocalyptic number.

It is an amenable number.

51538068 is an abundant number, since it is smaller than the sum of its proper divisors (78738806).

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

51538068 is a wasteful number, since it uses less digits than its factorization.

51538068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1431623 (or 1431618 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The square root of 51538068 is about 7179.0018804845. The cubic root of 51538068 is about 372.1425918846.

It can be divided in two parts, 515 and 38068, that added together give a palindrome (38583).

The spelling of 51538068 in words is "fifty-one million, five hundred thirty-eight thousand, sixty-eight".