28290607 has 4 divisors (see below), whose sum is σ = 29055256. Its totient is φ = 27525960.

The previous prime is 28290599. The next prime is 28290643. The reversal of 28290607 is 70609282.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28290607 - 2³ = 28290599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28290007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 382269 + ... + 382342.

It is an arithmetic number, because the mean of its divisors is an integer number (7263814).

Almost surely, 2^28290607 is an apocalyptic number.

28290607 is a deficient number, since it is larger than the sum of its proper divisors (764649).

28290607 is an equidigital number, since it uses as much as digits as its factorization.

28290607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 764648.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 28290607 is about 5318.8915198564. The cubic root of 28290607 is about 304.7058240323.

Adding to 28290607 its reverse (70609282), we get a palindrome (98899889).

The spelling of 28290607 in words is "twenty-eight million, two hundred ninety thousand, six hundred seven".