28981097 has 4 divisors (see below), whose sum is σ = 29655120. Its totient is φ = 28307076.

The previous prime is 28981067. The next prime is 28981109. The reversal of 28981097 is 79018982.

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 a cyclic number.

It is not a de Polignac number, because 28981097 - 2⁸ = 28980841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28981037) 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, 336947 + ... + 337032.

It is an arithmetic number, because the mean of its divisors is an integer number (7413780).

Almost surely, 2^28981097 is an apocalyptic number.

It is an amenable number.

28981097 is a deficient number, since it is larger than the sum of its proper divisors (674023).

28981097 is an equidigital number, since it uses as much as digits as its factorization.

28981097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 674022.

The product of its (nonzero) digits is 72576, while the sum is 44.

The square root of 28981097 is about 5383.4094215469. The cubic root of 28981097 is about 307.1649140306.

The spelling of 28981097 in words is "twenty-eight million, nine hundred eighty-one thousand, ninety-seven".