28258399 has 8 divisors (see below), whose sum is σ = 30543632. Its totient is φ = 25989120.

The previous prime is 28258387. The next prime is 28258409. The reversal of 28258399 is 99385282.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28258399 - 2⁵ = 28258367 is a prime.

It is a super-2 number, since 2×28258399² = 1597074228086402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28258319) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 162 + ... + 7519.

It is an arithmetic number, because the mean of its divisors is an integer number (3817954).

Almost surely, 2^28258399 is an apocalyptic number.

28258399 is a deficient number, since it is larger than the sum of its proper divisors (2285233).

28258399 is a wasteful number, since it uses less digits than its factorization.

28258399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7977.

The product of its digits is 311040, while the sum is 46.

The square root of 28258399 is about 5315.8629591065. The cubic root of 28258399 is about 304.5901473363.

The spelling of 28258399 in words is "twenty-eight million, two hundred fifty-eight thousand, three hundred ninety-nine".