28406897 has 4 divisors (see below), whose sum is σ = 28442736. Its totient is φ = 28371060.

The previous prime is 28406879. The next prime is 28406923. The reversal of 28406897 is 79860482.

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 28406897 - 2⁸ = 28406641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28406837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16703 + ... + 18324.

It is an arithmetic number, because the mean of its divisors is an integer number (7110684).

Almost surely, 2^28406897 is an apocalyptic number.

It is an amenable number.

28406897 is a deficient number, since it is larger than the sum of its proper divisors (35839).

28406897 is an equidigital number, since it uses as much as digits as its factorization.

28406897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35838.

The product of its (nonzero) digits is 193536, while the sum is 44.

The square root of 28406897 is about 5329.8120980012. The cubic root of 28406897 is about 305.1227562839.

The spelling of 28406897 in words is "twenty-eight million, four hundred six thousand, eight hundred ninety-seven".