51187480 has 16 divisors (see below), whose sum is σ = 115171920. Its totient is φ = 20474976.

The previous prime is 51187469. The next prime is 51187483. The reversal of 51187480 is 8478115.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51187483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 639804 + ... + 639883.

It is an arithmetic number, because the mean of its divisors is an integer number (7198245).

Almost surely, 2^51187480 is an apocalyptic number.

It is an amenable number.

51187480 is an abundant number, since it is smaller than the sum of its proper divisors (63984440).

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

51187480 is a wasteful number, since it uses less digits than its factorization.

51187480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1279698 (or 1279694 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 34.

The square root of 51187480 is about 7154.5426129138. The cubic root of 51187480 is about 371.2968371944.

The spelling of 51187480 in words is "fifty-one million, one hundred eighty-seven thousand, four hundred eighty".