28459431 has 96 divisors (see below), whose sum is σ = 57623040. Its totient is φ = 13646880.

The previous prime is 28459429. The next prime is 28459451. The reversal of 28459431 is 13495482.

It is not a de Polignac number, because 28459431 - 2¹ = 28459429 is a prime.

It is a super-2 number, since 2×28459431² = 1619878425687522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28459451) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2189181 + ... + 2189193.

It is an arithmetic number, because the mean of its divisors is an integer number (600240).

Almost surely, 2^28459431 is an apocalyptic number.

28459431 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28459431 is an abundant number, since it is smaller than the sum of its proper divisors (29163609).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28459431 is an equidigital number, since it uses as much as digits as its factorization.

28459431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65 (or 34 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 28459431 is about 5334.7381379033. The cubic root of 28459431 is about 305.3107323213.

The spelling of 28459431 in words is "twenty-eight million, four hundred fifty-nine thousand, four hundred thirty-one".