51587244 has 18 divisors (see below), whose sum is σ = 130401180. Its totient is φ = 17195736.

The previous prime is 51587203. The next prime is 51587257. The reversal of 51587244 is 44278515.

51587244 is a `hidden beast` number, since 51 + 587 + 24 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×51587244² = 5322487487031072, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 1432979 = 51587244 / (5 + 1 + 5 + 8 + 7 + 2 + 4 + 4).

It is a junction number, because it is equal to n+sod(n) for n = 51587199 and 51587208.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 716454 + ... + 716525.

It is an arithmetic number, because the mean of its divisors is an integer number (7244510).

Almost surely, 2^51587244 is an apocalyptic number.

It is an amenable number.

51587244 is an abundant number, since it is smaller than the sum of its proper divisors (78813936).

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

51587244 is a wasteful number, since it uses less digits than its factorization.

51587244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1432989 (or 1432984 counting only the distinct ones).

The product of its digits is 44800, while the sum is 36.

The square root of 51587244 is about 7182.4260525257. The cubic root of 51587244 is about 372.2609165025.

The spelling of 51587244 in words is "fifty-one million, five hundred eighty-seven thousand, two hundred forty-four".