28340431 has 16 divisors (see below), whose sum is σ = 33177600. Its totient is φ = 23708160.

The previous prime is 28340423. The next prime is 28340467. The reversal of 28340431 is 13404382.

It is not a de Polignac number, because 28340431 - 2³ = 28340423 is a prime.

It is a super-2 number, since 2×28340431² = 1606360058531522, 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 = 28340396 and 28340405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28340491) 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 15 ways as a sum of consecutive naturals, for example, 62895 + ... + 63343.

It is an arithmetic number, because the mean of its divisors is an integer number (2073600).

Almost surely, 2^28340431 is an apocalyptic number.

28340431 is a deficient number, since it is larger than the sum of its proper divisors (4837169).

28340431 is a wasteful number, since it uses less digits than its factorization.

28340431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 654.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 28340431 is about 5323.5731421668. The cubic root of 28340431 is about 304.8845966698.

The spelling of 28340431 in words is "twenty-eight million, three hundred forty thousand, four hundred thirty-one".