87979967 has 4 divisors (see below), whose sum is σ = 88374720. Its totient is φ = 87585216.

The previous prime is 87979949. The next prime is 87979987. The reversal of 87979967 is 76997978.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 87979967 - 2¹⁸ = 87717823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87979987) 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, 197042 + ... + 197487.

It is an arithmetic number, because the mean of its divisors is an integer number (22093680).

Almost surely, 2^87979967 is an apocalyptic number.

87979967 is a deficient number, since it is larger than the sum of its proper divisors (394753).

87979967 is a wasteful number, since it uses less digits than its factorization.

87979967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394752.

The product of its digits is 12002256, while the sum is 62.

The square root of 87979967 is about 9379.7636963838. The cubic root of 87979967 is about 444.7622632848.

The spelling of 87979967 in words is "eighty-seven million, nine hundred seventy-nine thousand, nine hundred sixty-seven".