87899765 has 8 divisors (see below), whose sum is σ = 105530040. Its totient is φ = 70286272.

The previous prime is 87899759. The next prime is 87899839. The reversal of 87899765 is 56799878.

It can be written as a sum of positive squares in 4 ways, for example, as 33154564 + 54745201 = 5758^2 + 7399^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 87899765 - 2¹² = 87895669 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18671 + ... + 22899.

It is an arithmetic number, because the mean of its divisors is an integer number (13191255).

Almost surely, 2^87899765 is an apocalyptic number.

It is an amenable number.

87899765 is a deficient number, since it is larger than the sum of its proper divisors (17630275).

87899765 is a wasteful number, since it uses less digits than its factorization.

87899765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8391.

The product of its digits is 7620480, while the sum is 59.

The square root of 87899765 is about 9375.4874539941. The cubic root of 87899765 is about 444.6270746775.

The spelling of 87899765 in words is "eighty-seven million, eight hundred ninety-nine thousand, seven hundred sixty-five".