87149979 has 48 divisors (see below), whose sum is σ = 158140800. Its totient is φ = 47165328.

The previous prime is 87149929. The next prime is 87149987. The reversal of 87149979 is 97994178.

87149979 is a `hidden beast` number, since 87 + 1 + 499 + 79 = 666.

It is not a de Polignac number, because 87149979 - 2¹³ = 87141787 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87149929) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 23404 + ... + 26870.

It is an arithmetic number, because the mean of its divisors is an integer number (3294600).

Almost surely, 2^87149979 is an apocalyptic number.

87149979 is a deficient number, since it is larger than the sum of its proper divisors (70990821).

87149979 is a wasteful number, since it uses less digits than its factorization.

87149979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3509 (or 3496 counting only the distinct ones).

The product of its digits is 1143072, while the sum is 54.

The square root of 87149979 is about 9335.4153094546. The cubic root of 87149979 is about 443.3592382524.

The spelling of 87149979 in words is "eighty-seven million, one hundred forty-nine thousand, nine hundred seventy-nine".