51645960 has 48 divisors (see below), whose sum is σ = 167850540. Its totient is φ = 13772160.

The previous prime is 51645959. The next prime is 51645961. The reversal of 51645960 is 6954615.

51645960 is a `hidden beast` number, since 5 + 1 + 64 + 596 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (51645959) and next prime (51645961).

It can be written as a sum of positive squares in 2 ways, for example, as 51065316 + 580644 = 7146^2 + 762^2 .

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

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

It is not an unprimeable number, because it can be changed into a prime (51645961) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 71371 + ... + 72090.

Almost surely, 2^51645960 is an apocalyptic number.

It is an amenable number.

51645960 is an abundant number, since it is smaller than the sum of its proper divisors (116204580).

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

51645960 is a wasteful number, since it uses less digits than its factorization.

51645960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143478 (or 143471 counting only the distinct ones).

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

The square root of 51645960 is about 7186.5123669274. The cubic root of 51645960 is about 372.4020972984.

The spelling of 51645960 in words is "fifty-one million, six hundred forty-five thousand, nine hundred sixty".