99987977 has 4 divisors (see below), whose sum is σ = 100751376. Its totient is φ = 99224580.

The previous prime is 99987973. The next prime is 99987983. The reversal of 99987977 is 77978999.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 99987977 - 2² = 99987973 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99987973) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 381503 + ... + 381764.

It is an arithmetic number, because the mean of its divisors is an integer number (25187844).

Almost surely, 2^99987977 is an apocalyptic number.

It is an amenable number.

99987977 is a deficient number, since it is larger than the sum of its proper divisors (763399).

99987977 is a wasteful number, since it uses less digits than its factorization.

99987977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 763398.

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

The square root of 99987977 is about 9999.3988319298. The cubic root of 99987977 is about 464.1402806749.

The spelling of 99987977 in words is "ninety-nine million, nine hundred eighty-seven thousand, nine hundred seventy-seven".