99887765 has 4 divisors (see below), whose sum is σ = 119865324. Its totient is φ = 79910208.

The previous prime is 99887759. The next prime is 99887771. The reversal of 99887765 is 56778899.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (99887759) and next prime (99887771).

It can be written as a sum of positive squares in 2 ways, for example, as 46758244 + 53129521 = 6838^2 + 7289^2 .

It is a cyclic number.

It is not a de Polignac number, because 99887765 - 2⁶ = 99887701 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9988772 + ... + 9988781.

It is an arithmetic number, because the mean of its divisors is an integer number (29966331).

Almost surely, 2^99887765 is an apocalyptic number.

It is an amenable number.

99887765 is a deficient number, since it is larger than the sum of its proper divisors (19977559).

99887765 is a wasteful number, since it uses less digits than its factorization.

99887765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19977558.

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

The square root of 99887765 is about 9994.3866745289. The cubic root of 99887765 is about 463.9851687813.

The spelling of 99887765 in words is "ninety-nine million, eight hundred eighty-seven thousand, seven hundred sixty-five".