28255031 has 4 divisors (see below), whose sum is σ = 32291472. Its totient is φ = 24218592.

The previous prime is 28255001. The next prime is 28255049. The reversal of 28255031 is 13055282.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13055282 = 2 ⋅6527641.

It is a cyclic number.

It is not a de Polignac number, because 28255031 - 2¹⁴ = 28238647 is a prime.

It is a super-2 number, since 2×28255031² = 1596693553621922, 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 (28255001) 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, 2018210 + ... + 2018223.

It is an arithmetic number, because the mean of its divisors is an integer number (8072868).

Almost surely, 2^28255031 is an apocalyptic number.

28255031 is a deficient number, since it is larger than the sum of its proper divisors (4036441).

28255031 is an equidigital number, since it uses as much as digits as its factorization.

28255031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4036440.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 28255031 is about 5315.5461619668. The cubic root of 28255031 is about 304.5780459150.

The spelling of 28255031 in words is "twenty-eight million, two hundred fifty-five thousand, thirty-one".