87999977 has 4 divisors (see below), whose sum is σ = 94769220. Its totient is φ = 81230736.

The previous prime is 87999971. The next prime is 87999997. The reversal of 87999977 is 77999978.

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

It can be written as a sum of positive squares in 2 ways, for example, as 15085456 + 72914521 = 3884^2 + 8539^2 .

It is a cyclic number.

It is not a de Polignac number, because 87999977 - 2⁸ = 87999721 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87999971) 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, 3384602 + ... + 3384627.

It is an arithmetic number, because the mean of its divisors is an integer number (23692305).

Almost surely, 2^87999977 is an apocalyptic number.

It is an amenable number.

87999977 is a deficient number, since it is larger than the sum of its proper divisors (6769243).

87999977 is a wasteful number, since it uses less digits than its factorization.

87999977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6769242.

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

The square root of 87999977 is about 9380.8302937427. The cubic root of 87999977 is about 444.7959793627.

Subtracting from 87999977 its reverse (77999978), we obtain a palindrome (9999999).

The spelling of 87999977 in words is "eighty-seven million, nine hundred ninety-nine thousand, nine hundred seventy-seven".