51135660 has 108 divisors (see below), whose sum is σ = 164940048. Its totient is φ = 12820992.

The previous prime is 51135659. The next prime is 51135683. The reversal of 51135660 is 6653115.

It is a happy number.

It is a super-2 number, since 2×51135660² = 5229711447271200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 51529 + ... + 52511.

Almost surely, 2^51135660 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 51135660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82470024).

51135660 is an abundant number, since it is smaller than the sum of its proper divisors (113804388).

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

51135660 is a wasteful number, since it uses less digits than its factorization.

51135660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1032 (or 1010 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The square root of 51135660 is about 7150.9202205031. The cubic root of 51135660 is about 371.1714999144.

Adding to 51135660 its reverse (6653115), we get a palindrome (57788775).

The spelling of 51135660 in words is "fifty-one million, one hundred thirty-five thousand, six hundred sixty".