87523979 has 4 divisors (see below), whose sum is σ = 88103760. Its totient is φ = 86944200.

The previous prime is 87523949. The next prime is 87523999. The reversal of 87523979 is 97932578.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97932578 = 2 ⋅48966289.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87523979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87523949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 289664 + ... + 289965.

It is an arithmetic number, because the mean of its divisors is an integer number (22025940).

Almost surely, 2^87523979 is an apocalyptic number.

87523979 is a deficient number, since it is larger than the sum of its proper divisors (579781).

87523979 is a wasteful number, since it uses less digits than its factorization.

87523979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 579780.

The product of its digits is 952560, while the sum is 50.

The square root of 87523979 is about 9355.4251105976. The cubic root of 87523979 is about 443.9925515483.

The spelling of 87523979 in words is "eighty-seven million, five hundred twenty-three thousand, nine hundred seventy-nine".