51718380 has 96 divisors (see below), whose sum is σ = 174236160. Its totient is φ = 11197440.

The previous prime is 51718351. The next prime is 51718391. The reversal of 51718380 is 8381715.

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, 4740 + ... + 11220.

It is an arithmetic number, because the mean of its divisors is an integer number (1814960).

Almost surely, 2^51718380 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 51718380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87118080).

51718380 is an abundant number, since it is smaller than the sum of its proper divisors (122517780).

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

51718380 is a wasteful number, since it uses less digits than its factorization.

51718380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6519 (or 6517 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 33.

The square root of 51718380 is about 7191.5492072293. The cubic root of 51718380 is about 372.5760816324.

The spelling of 51718380 in words is "fifty-one million, seven hundred eighteen thousand, three hundred eighty".