28279497 has 4 divisors (see below), whose sum is σ = 37706000. Its totient is φ = 18852996.

The previous prime is 28279469. The next prime is 28279499. The reversal of 28279497 is 79497282.

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 not a de Polignac number, because 28279497 - 2⁸ = 28279241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28279499) 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, 4713247 + ... + 4713252.

It is an arithmetic number, because the mean of its divisors is an integer number (9426500).

Almost surely, 2^28279497 is an apocalyptic number.

It is an amenable number.

28279497 is a deficient number, since it is larger than the sum of its proper divisors (9426503).

28279497 is an equidigital number, since it uses as much as digits as its factorization.

28279497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9426502.

The product of its digits is 508032, while the sum is 48.

The square root of 28279497 is about 5317.8470267581. The cubic root of 28279497 is about 304.6659318171.

The spelling of 28279497 in words is "twenty-eight million, two hundred seventy-nine thousand, four hundred ninety-seven".