28992117 has 16 divisors (see below), whose sum is σ = 48195072. Its totient is φ = 15060720.

The previous prime is 28992107. The next prime is 28992137. The reversal of 28992117 is 71129982.

It is not a de Polignac number, because 28992117 - 2⁴ = 28992101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28992107) 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, 62523 + ... + 62984.

It is an arithmetic number, because the mean of its divisors is an integer number (3012192).

Almost surely, 2^28992117 is an apocalyptic number.

It is an amenable number.

28992117 is a deficient number, since it is larger than the sum of its proper divisors (19202955).

28992117 is a wasteful number, since it uses less digits than its factorization.

28992117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125528.

The product of its digits is 18144, while the sum is 39.

The square root of 28992117 is about 5384.4328392134. The cubic root of 28992117 is about 307.2038420303.

The spelling of 28992117 in words is "twenty-eight million, nine hundred ninety-two thousand, one hundred seventeen".