28992971 has 4 divisors (see below), whose sum is σ = 33134832. Its totient is φ = 24851112.

The previous prime is 28992947. The next prime is 28992983. The reversal of 28992971 is 17929982.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28992971 - 2¹⁰ = 28991947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28992991) 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, 2070920 + ... + 2070933.

It is an arithmetic number, because the mean of its divisors is an integer number (8283708).

Almost surely, 2^28992971 is an apocalyptic number.

28992971 is a deficient number, since it is larger than the sum of its proper divisors (4141861).

28992971 is an equidigital number, since it uses as much as digits as its factorization.

28992971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4141860.

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

The square root of 28992971 is about 5384.5121413179. The cubic root of 28992971 is about 307.2068583617.

The spelling of 28992971 in words is "twenty-eight million, nine hundred ninety-two thousand, nine hundred seventy-one".