87969979 has 16 divisors (see below), whose sum is σ = 92474368. Its totient is φ = 83607552.

The previous prime is 87969953. The next prime is 87970007. The reversal of 87969979 is 97996978.

It is a cyclic number.

It is not a de Polignac number, because 87969979 - 2⁹ = 87969467 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 87969979.

It is not an unprimeable number, because it can be changed into a prime (87969949) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 455707 + ... + 455899.

It is an arithmetic number, because the mean of its divisors is an integer number (5779648).

Almost surely, 2^87969979 is an apocalyptic number.

87969979 is a deficient number, since it is larger than the sum of its proper divisors (4504389).

87969979 is a wasteful number, since it uses less digits than its factorization.

87969979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 454.

The product of its digits is 15431472, while the sum is 64.

The square root of 87969979 is about 9379.2312584774. The cubic root of 87969979 is about 444.7454319774.

The spelling of 87969979 in words is "eighty-seven million, nine hundred sixty-nine thousand, nine hundred seventy-nine".