28255931 has 8 divisors (see below), whose sum is σ = 30945024. Its totient is φ = 25586920.

The previous prime is 28255919. The next prime is 28255933. The reversal of 28255931 is 13955282.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28255931 - 2¹⁰ = 28254907 is a prime.

It is a super-2 number, since 2×28255931² = 1596795273353522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28255891 and 28255900.

It is not an unprimeable number, because it can be changed into a prime (28255933) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1991 + ... + 7776.

It is an arithmetic number, because the mean of its divisors is an integer number (3868128).

Almost surely, 2^28255931 is an apocalyptic number.

28255931 is a deficient number, since it is larger than the sum of its proper divisors (2689093).

28255931 is a wasteful number, since it uses less digits than its factorization.

28255931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10041.

The product of its digits is 21600, while the sum is 35.

The square root of 28255931 is about 5315.6308186329. The cubic root of 28255931 is about 304.5812797619.

The spelling of 28255931 in words is "twenty-eight million, two hundred fifty-five thousand, nine hundred thirty-one".