87640751 has 24 divisors (see below), whose sum is σ = 101767680. Its totient is φ = 74768400.

The previous prime is 87640723. The next prime is 87640793. The reversal of 87640751 is 15704678.

It is a de Polignac number, because none of the positive numbers 2^k-87640751 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87640351) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 630440 + ... + 630578.

It is an arithmetic number, because the mean of its divisors is an integer number (4240320).

Almost surely, 2^87640751 is an apocalyptic number.

87640751 is a deficient number, since it is larger than the sum of its proper divisors (14126929).

87640751 is a wasteful number, since it uses less digits than its factorization.

87640751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267 (or 224 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 38.

The square root of 87640751 is about 9361.6639012517. The cubic root of 87640751 is about 444.1899178731.

The spelling of 87640751 in words is "eighty-seven million, six hundred forty thousand, seven hundred fifty-one".