87223979 has 4 divisors (see below), whose sum is σ = 88328160. Its totient is φ = 86119800.

The previous prime is 87223951. The next prime is 87224051. The reversal of 87223979 is 97932278.

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 87223979 - 2⁸ = 87223723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87223949) 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, 551972 + ... + 552129.

It is an arithmetic number, because the mean of its divisors is an integer number (22082040).

Almost surely, 2^87223979 is an apocalyptic number.

87223979 is a deficient number, since it is larger than the sum of its proper divisors (1104181).

87223979 is a wasteful number, since it uses less digits than its factorization.

87223979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1104180.

The product of its digits is 381024, while the sum is 47.

The square root of 87223979 is about 9339.3778700725. The cubic root of 87223979 is about 443.4846898105.

The spelling of 87223979 in words is "eighty-seven million, two hundred twenty-three thousand, nine hundred seventy-nine".