51687360 has 168 divisors, whose sum is σ = 180447696. Its totient is φ = 13578240.

The previous prime is 51687359. The next prime is 51687379. The reversal of 51687360 is 6378615.

51687360 is a `hidden beast` number, since 516 + 87 + 3 + 60 = 666.

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

It is a congruent number.

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, 377212 + ... + 377348.

Almost surely, 2^51687360 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 51687360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90223848).

51687360 is an abundant number, since it is smaller than the sum of its proper divisors (128760336).

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

51687360 is a wasteful number, since it uses less digits than its factorization.

51687360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291 (or 278 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 51687360 is about 7189.3921857136. The cubic root of 51687360 is about 372.5015780003.

The spelling of 51687360 in words is "fifty-one million, six hundred eighty-seven thousand, three hundred sixty".