87977 has 2 divisors, whose sum is σ = 87978. Its totient is φ = 87976.

The previous prime is 87973. The next prime is 87991. The reversal of 87977 is 77978.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87616 + 361 = 296^2 + 19^2 .

It is a cyclic number.

It is not a de Polignac number, because 87977 - 2² = 87973 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 87977.

It is not a weakly prime, because it can be changed into another prime (87973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43988 + 43989.

It is an arithmetic number, because the mean of its divisors is an integer number (43989).

2⁸⁷⁹⁷⁷ is an apocalyptic number.

It is an amenable number.

87977 is a deficient number, since it is larger than the sum of its proper divisors (1).

87977 is an equidigital number, since it uses as much as digits as its factorization.

87977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24696, while the sum is 38.

The square root of 87977 is about 296.6091704584. The cubic root of 87977 is about 44.4757263569.

Subtracting from 87977 its reverse (77978), we obtain a palindrome (9999).

The spelling of 87977 in words is "eighty-seven thousand, nine hundred seventy-seven".