51917760 has 140 divisors (see below), whose sum is σ = 184772808. Its totient is φ = 13837824.

The previous prime is 51917753. The next prime is 51917809. The reversal of 51917760 is 6771915.

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

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 24919 + ... + 26921.

Almost surely, 2^51917760 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 51917760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92386404).

51917760 is an abundant number, since it is smaller than the sum of its proper divisors (132855048).

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

51917760 is a wasteful number, since it uses less digits than its factorization.

51917760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2032 (or 2013 counting only the distinct ones).

The product of its (nonzero) digits is 13230, while the sum is 36.

The square root of 51917760 is about 7205.3979765173. The cubic root of 51917760 is about 373.0542415254.

The spelling of 51917760 in words is "fifty-one million, nine hundred seventeen thousand, seven hundred sixty".