28428297 has 4 divisors (see below), whose sum is σ = 37904400. Its totient is φ = 18952196.

The previous prime is 28428287. The next prime is 28428307. The reversal of 28428297 is 79282482.

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 an interprime number because it is at equal distance from previous prime (28428287) and next prime (28428307).

It is a cyclic number.

It is not a de Polignac number, because 28428297 - 2¹⁵ = 28395529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28428217) 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, 4738047 + ... + 4738052.

It is an arithmetic number, because the mean of its divisors is an integer number (9476100).

Almost surely, 2^28428297 is an apocalyptic number.

It is an amenable number.

28428297 is a deficient number, since it is larger than the sum of its proper divisors (9476103).

28428297 is an equidigital number, since it uses as much as digits as its factorization.

28428297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9476102.

The product of its digits is 129024, while the sum is 42.

The square root of 28428297 is about 5331.8192955126. The cubic root of 28428297 is about 305.1993572586.

The spelling of 28428297 in words is "twenty-eight million, four hundred twenty-eight thousand, two hundred ninety-seven".