99977987 has 8 divisors (see below), whose sum is σ = 104633856. Its totient is φ = 95347912.

The previous prime is 99977923. The next prime is 99977989. The reversal of 99977987 is 78977999.

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 99977987 - 2⁶ = 99977923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99977989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1718 + ... + 14244.

It is an arithmetic number, because the mean of its divisors is an integer number (13079232).

Almost surely, 2^99977987 is an apocalyptic number.

99977987 is a deficient number, since it is larger than the sum of its proper divisors (4655869).

99977987 is a wasteful number, since it uses less digits than its factorization.

99977987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12897.

The product of its digits is 18003384, while the sum is 65.

The square root of 99977987 is about 9998.8992894218. The cubic root of 99977987 is about 464.1248224302.

The spelling of 99977987 in words is "ninety-nine million, nine hundred seventy-seven thousand, nine hundred eighty-seven".