28992317 has 4 divisors (see below), whose sum is σ = 29008896. Its totient is φ = 28975740.

The previous prime is 28992311. The next prime is 28992323. The reversal of 28992317 is 71329982.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (28992311) and next prime (28992323).

It is a cyclic number.

It is not a de Polignac number, because 28992317 - 2⁶ = 28992253 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 (28992311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5309 + ... + 9282.

It is an arithmetic number, because the mean of its divisors is an integer number (7252224).

Almost surely, 2^28992317 is an apocalyptic number.

It is an amenable number.

28992317 is a deficient number, since it is larger than the sum of its proper divisors (16579).

28992317 is a wasteful number, since it uses less digits than its factorization.

28992317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16578.

The product of its digits is 54432, while the sum is 41.

The square root of 28992317 is about 5384.4514112396. The cubic root of 28992317 is about 307.2045484364.

The spelling of 28992317 in words is "twenty-eight million, nine hundred ninety-two thousand, three hundred seventeen".