87928129 has 3 divisors (see below), whose sum is σ = 87937507. Its totient is φ = 87918752.

The previous prime is 87928111. The next prime is 87928133. The reversal of 87928129 is 92182978.

The square root of 87928129 is 9377.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 9641025 + 78287104 = 3105^2 + 8848^2 .

It is not a de Polignac number, because 87928129 - 2⁹ = 87927617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87928829) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 4689 + ... + 14065.

Almost surely, 2^87928129 is an apocalyptic number.

87928129 is the 9377-th square number.

87928129 is the 4689-th centered octagonal number.

It is an amenable number.

87928129 is a deficient number, since it is larger than the sum of its proper divisors (9378).

87928129 is an frugal number, since it uses more digits than its factorization.

87928129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18754 (or 9377 counting only the distinct ones).

The product of its digits is 145152, while the sum is 46.

The cubic root of 87928129 is about 444.6748944719.

The spelling of 87928129 in words is "eighty-seven million, nine hundred twenty-eight thousand, one hundred twenty-nine".