28431319 has 6 divisors (see below), whose sum is σ = 33073224. Its totient is φ = 24369660.

The previous prime is 28431313. The next prime is 28431331. The reversal of 28431319 is 91313482.

It is not a de Polignac number, because 28431319 - 2⁹ = 28430807 is a prime.

It is a super-2 number, since 2×28431319² = 1616679800159522, 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 (28431313) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 290067 + ... + 290164.

It is an arithmetic number, because the mean of its divisors is an integer number (5512204).

Almost surely, 2^28431319 is an apocalyptic number.

28431319 is a deficient number, since it is larger than the sum of its proper divisors (4641905).

28431319 is an equidigital number, since it uses as much as digits as its factorization.

28431319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 580245 (or 580238 counting only the distinct ones).

The product of its digits is 5184, while the sum is 31.

The square root of 28431319 is about 5332.1026809318. The cubic root of 28431319 is about 305.2101713637.

The spelling of 28431319 in words is "twenty-eight million, four hundred thirty-one thousand, three hundred nineteen".