51700680 has 144 divisors (see below), whose sum is σ = 175366620. Its totient is φ = 13716864.

The previous prime is 51700679. The next prime is 51700703. The reversal of 51700680 is 8600715.

It can be written as a sum of positive squares in 2 ways, for example, as 48525156 + 3175524 = 6966^2 + 1782^2 .

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 262342 + ... + 262538.

Almost surely, 2^51700680 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 51700680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87683310).

51700680 is an abundant number, since it is smaller than the sum of its proper divisors (123665940).

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

51700680 is an equidigital number, since it uses as much as digits as its factorization.

51700680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232 (or 207 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 51700680 is about 7190.3184908598. The cubic root of 51700680 is about 372.5335735395.

The spelling of 51700680 in words is "fifty-one million, seven hundred thousand, six hundred eighty".