28390567 has 4 divisors (see below), whose sum is σ = 28578736. Its totient is φ = 28202400.

The previous prime is 28390543. The next prime is 28390589. The reversal of 28390567 is 76509382.

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 28390567 - 2²³ = 20001959 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 (28390517) 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, 93858 + ... + 94159.

It is an arithmetic number, because the mean of its divisors is an integer number (7144684).

Almost surely, 2^28390567 is an apocalyptic number.

28390567 is a deficient number, since it is larger than the sum of its proper divisors (188169).

28390567 is a wasteful number, since it uses less digits than its factorization.

28390567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188168.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 28390567 is about 5328.2799288326. The cubic root of 28390567 is about 305.0642774141.

The spelling of 28390567 in words is "twenty-eight million, three hundred ninety thousand, five hundred sixty-seven".