51495660 has 72 divisors (see below), whose sum is σ = 158383680. Its totient is φ = 13540608.

The previous prime is 51495659. The next prime is 51495673. The reversal of 51495660 is 6659415.

51495660 is a `hidden beast` number, since 51 + 49 + 566 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11181 + ... + 15099.

Almost surely, 2^51495660 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 51495660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79191840).

51495660 is an abundant number, since it is smaller than the sum of its proper divisors (106888020).

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

51495660 is a wasteful number, since it uses less digits than its factorization.

51495660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4007 (or 4002 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The square root of 51495660 is about 7176.0476587046. The cubic root of 51495660 is about 372.0404916035.

The spelling of 51495660 in words is "fifty-one million, four hundred ninety-five thousand, six hundred sixty".