87213977 has 4 divisors (see below), whose sum is σ = 88692240. Its totient is φ = 85735716.

The previous prime is 87213949. The next prime is 87213989. The reversal of 87213977 is 77931278.

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 a de Polignac number, because none of the positive numbers 2^k-87213977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87213937) 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, 739043 + ... + 739160.

It is an arithmetic number, because the mean of its divisors is an integer number (22173060).

Almost surely, 2^87213977 is an apocalyptic number.

It is an amenable number.

87213977 is a deficient number, since it is larger than the sum of its proper divisors (1478263).

87213977 is a wasteful number, since it uses less digits than its factorization.

87213977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1478262.

The product of its digits is 148176, while the sum is 44.

The square root of 87213977 is about 9338.8423800812. The cubic root of 87213977 is about 443.4677376548.

The spelling of 87213977 in words is "eighty-seven million, two hundred thirteen thousand, nine hundred seventy-seven".