28300431 has 4 divisors (see below), whose sum is σ = 37733912. Its totient is φ = 18866952.

The previous prime is 28300423. The next prime is 28300451. The reversal of 28300431 is 13400382.

It is a happy number.

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

It is not a de Polignac number, because 28300431 - 2³ = 28300423 is a prime.

It is a super-2 number, since 2×28300431² = 1601828789571522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28300398 and 28300407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28300451) 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, 4716736 + ... + 4716741.

It is an arithmetic number, because the mean of its divisors is an integer number (9433478).

Almost surely, 2^28300431 is an apocalyptic number.

28300431 is a deficient number, since it is larger than the sum of its proper divisors (9433481).

28300431 is an equidigital number, since it uses as much as digits as its factorization.

28300431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9433480.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 28300431 is about 5319.8149403903. The cubic root of 28300431 is about 304.7410899610.

The spelling of 28300431 in words is "twenty-eight million, three hundred thousand, four hundred thirty-one".