28031319 has 16 divisors (see below), whose sum is σ = 43334400. Its totient is φ = 17874648.

The previous prime is 28031309. The next prime is 28031321. The reversal of 28031319 is 91313082.

It is not a de Polignac number, because 28031319 - 2⁴ = 28031303 is a prime.

It is a super-2 number, since 2×28031319² = 1571509689759522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 28031292 and 28031301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28031309) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21949 + ... + 23190.

It is an arithmetic number, because the mean of its divisors is an integer number (2708400).

Almost surely, 2^28031319 is an apocalyptic number.

28031319 is a deficient number, since it is larger than the sum of its proper divisors (15303081).

28031319 is a wasteful number, since it uses less digits than its factorization.

28031319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45171 (or 45165 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 28031319 is about 5294.4611623847. The cubic root of 28031319 is about 303.7720727749.

The spelling of 28031319 in words is "twenty-eight million, thirty-one thousand, three hundred nineteen".