87251979 has 8 divisors (see below), whose sum is σ = 116402832. Its totient is φ = 58134560.

The previous prime is 87251963. The next prime is 87251987. The reversal of 87251979 is 97915278.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 87251979 - 2⁴ = 87251963 is a prime.

It is a super-2 number, since 2×87251979² = 15225815678832882, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (87251909) 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 7 ways as a sum of consecutive naturals, for example, 1452 + ... + 13289.

It is an arithmetic number, because the mean of its divisors is an integer number (14550354).

Almost surely, 2^87251979 is an apocalyptic number.

87251979 is a deficient number, since it is larger than the sum of its proper divisors (29150853).

87251979 is a wasteful number, since it uses less digits than its factorization.

87251979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16717.

The product of its digits is 317520, while the sum is 48.

The square root of 87251979 is about 9340.8767789753. The cubic root of 87251979 is about 443.5321394643.

The spelling of 87251979 in words is "eighty-seven million, two hundred fifty-one thousand, nine hundred seventy-nine".