51087784 has 64 divisors (see below), whose sum is σ = 111767040. Its totient is φ = 21658560.

The previous prime is 51087733. The next prime is 51087791. The reversal of 51087784 is 48778015.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

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 15 ways as a sum of consecutive naturals, for example, 86739 + ... + 87325.

It is an arithmetic number, because the mean of its divisors is an integer number (1746360).

Almost surely, 2^51087784 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 51087784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55883520).

51087784 is an abundant number, since it is smaller than the sum of its proper divisors (60679256).

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

51087784 is a wasteful number, since it uses less digits than its factorization.

51087784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670 (or 666 counting only the distinct ones).

The product of its (nonzero) digits is 62720, while the sum is 40.

The square root of 51087784 is about 7147.5718954062. The cubic root of 51087784 is about 371.0556267290.

The spelling of 51087784 in words is "fifty-one million, eighty-seven thousand, seven hundred eighty-four".