28992917 has 8 divisors (see below), whose sum is σ = 30608160. Its totient is φ = 27386640.

The previous prime is 28992913. The next prime is 28992923. The reversal of 28992917 is 71929982.

It is a happy number.

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 28992917 - 2² = 28992913 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28992913) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5042 + ... + 9132.

It is an arithmetic number, because the mean of its divisors is an integer number (3826020).

Almost surely, 2^28992917 is an apocalyptic number.

It is an amenable number.

28992917 is a deficient number, since it is larger than the sum of its proper divisors (1615243).

28992917 is a wasteful number, since it uses less digits than its factorization.

28992917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4483.

The product of its digits is 163296, while the sum is 47.

The square root of 28992917 is about 5384.5071269337. The cubic root of 28992917 is about 307.2066676353.

The spelling of 28992917 in words is "twenty-eight million, nine hundred ninety-two thousand, nine hundred seventeen".