51388560 has 160 divisors (see below), whose sum is σ = 182071680. Its totient is φ = 13312512.

The previous prime is 51388543. The next prime is 51388591. The reversal of 51388560 is 6588315.

51388560 is a `hidden beast` number, since 5 + 13 + 88 + 560 = 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 31 ways as a sum of consecutive naturals, for example, 79599 + ... + 80241.

It is an arithmetic number, because the mean of its divisors is an integer number (1137948).

Almost surely, 2^51388560 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 51388560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91035840).

51388560 is an abundant number, since it is smaller than the sum of its proper divisors (130683120).

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

51388560 is a wasteful number, since it uses less digits than its factorization.

51388560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 702 (or 690 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The square root of 51388560 is about 7168.5814496314. The cubic root of 51388560 is about 371.7823909401.

The spelling of 51388560 in words is "fifty-one million, three hundred eighty-eight thousand, five hundred sixty".