28042331 has 4 divisors (see below), whose sum is σ = 28112664. Its totient is φ = 27972000.

The previous prime is 28042307. The next prime is 28042349. The reversal of 28042331 is 13324082.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13324082 = 2 ⋅6662041.

It is a cyclic number.

It is not a de Polignac number, because 28042331 - 2¹⁴ = 28025947 is a prime.

It is a super-2 number, since 2×28042331² = 1572744655827122, 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 = 28042297 and 28042306.

It is not an unprimeable number, because it can be changed into a prime (28041331) 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, 34565 + ... + 35366.

It is an arithmetic number, because the mean of its divisors is an integer number (7028166).

Almost surely, 2^28042331 is an apocalyptic number.

28042331 is a deficient number, since it is larger than the sum of its proper divisors (70333).

28042331 is an equidigital number, since it uses as much as digits as its factorization.

28042331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70332.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 28042331 is about 5295.5010150126. The cubic root of 28042331 is about 303.8118461455.

The spelling of 28042331 in words is "twenty-eight million, forty-two thousand, three hundred thirty-one".