87128499 has 16 divisors (see below), whose sum is σ = 120823200. Its totient is φ = 55781376.

The previous prime is 87128473. The next prime is 87128501. The reversal of 87128499 is 99482178.

It is not a de Polignac number, because 87128499 - 2⁵ = 87128467 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87128099) 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, 14197 + ... + 19385.

It is an arithmetic number, because the mean of its divisors is an integer number (7551450).

Almost surely, 2^87128499 is an apocalyptic number.

87128499 is a deficient number, since it is larger than the sum of its proper divisors (33694701).

87128499 is a wasteful number, since it uses less digits than its factorization.

87128499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5414.

The product of its digits is 290304, while the sum is 48.

The square root of 87128499 is about 9334.2647809027. The cubic root of 87128499 is about 443.3228100969.

The spelling of 87128499 in words is "eighty-seven million, one hundred twenty-eight thousand, four hundred ninety-nine".