28748897 has 4 divisors (see below), whose sum is σ = 29417520. Its totient is φ = 28080276.

The previous prime is 28748879. The next prime is 28748903. The reversal of 28748897 is 79884782.

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 a cyclic number.

It is not a de Polignac number, because 28748897 - 2¹⁸ = 28486753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28748807) 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, 334247 + ... + 334332.

It is an arithmetic number, because the mean of its divisors is an integer number (7354380).

Almost surely, 2^28748897 is an apocalyptic number.

It is an amenable number.

28748897 is a deficient number, since it is larger than the sum of its proper divisors (668623).

28748897 is an equidigital number, since it uses as much as digits as its factorization.

28748897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 668622.

The product of its digits is 1806336, while the sum is 53.

The square root of 28748897 is about 5361.7997911149. The cubic root of 28748897 is about 306.3423660307.

The spelling of 28748897 in words is "twenty-eight million, seven hundred forty-eight thousand, eight hundred ninety-seven".