28458231 has 8 divisors (see below), whose sum is σ = 38021760. Its totient is φ = 18933432.

The previous prime is 28458229. The next prime is 28458233. The reversal of 28458231 is 13285482.

It is an interprime number because it is at equal distance from previous prime (28458229) and next prime (28458233).

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

It is not a de Polignac number, because 28458231 - 2¹ = 28458229 is a prime.

It is a super-2 number, since 2×28458231² = 1619741823298722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28458192 and 28458201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28458233) 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, 7921 + ... + 10938.

It is an arithmetic number, because the mean of its divisors is an integer number (4752720).

Almost surely, 2^28458231 is an apocalyptic number.

28458231 is a deficient number, since it is larger than the sum of its proper divisors (9563529).

28458231 is a wasteful number, since it uses less digits than its factorization.

28458231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19365.

The product of its digits is 15360, while the sum is 33.

The square root of 28458231 is about 5334.6256663425. The cubic root of 28458231 is about 305.3064410897.

The spelling of 28458231 in words is "twenty-eight million, four hundred fifty-eight thousand, two hundred thirty-one".