51188720 has 40 divisors (see below), whose sum is σ = 129835440. Its totient is φ = 18613760.

The previous prime is 51188713. The next prime is 51188729. The reversal of 51188720 is 2788115.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51188729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28205 + ... + 29964.

It is an arithmetic number, because the mean of its divisors is an integer number (3245886).

Almost surely, 2^51188720 is an apocalyptic number.

It is an amenable number.

51188720 is an abundant number, since it is smaller than the sum of its proper divisors (78646720).

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

51188720 is a wasteful number, since it uses less digits than its factorization.

51188720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58193 (or 58187 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 32.

The square root of 51188720 is about 7154.6292706191. The cubic root of 51188720 is about 371.2998353518.

The spelling of 51188720 in words is "fifty-one million, one hundred eighty-eight thousand, seven hundred twenty".