51660504 has 120 divisors (see below), whose sum is σ = 168424740. Its totient is φ = 14751072.

The previous prime is 51660493. The next prime is 51660509. The reversal of 51660504 is 40506615.

It is a happy number.

51660504 is a `hidden beast` number, since 51 + 6 + 605 + 0 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51660509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 30939 + ... + 32565.

Almost surely, 2^51660504 is an apocalyptic number.

51660504 is a gapful number since it is divisible by the number (54) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51660504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84212370).

51660504 is an abundant number, since it is smaller than the sum of its proper divisors (116764236).

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

51660504 is a wasteful number, since it uses less digits than its factorization.

51660504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1659 (or 1639 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 51660504 is about 7187.5241912636. The cubic root of 51660504 is about 372.4370513571.

The spelling of 51660504 in words is "fifty-one million, six hundred sixty thousand, five hundred four".