28855931 has 8 divisors (see below), whose sum is σ = 31123344. Its totient is φ = 26595360.

The previous prime is 28855913. The next prime is 28855933. The reversal of 28855931 is 13955882.

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 28855931 - 2²² = 24661627 is a prime.

It is a super-2 number, since 2×28855931² = 1665329507753522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28855933) 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, 10136 + ... + 12666.

It is an arithmetic number, because the mean of its divisors is an integer number (3890418).

Almost surely, 2^28855931 is an apocalyptic number.

28855931 is a deficient number, since it is larger than the sum of its proper divisors (2267413).

28855931 is a wasteful number, since it uses less digits than its factorization.

28855931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3421.

The product of its digits is 86400, while the sum is 41.

The square root of 28855931 is about 5371.7716816708. The cubic root of 28855931 is about 306.7220726661.

The spelling of 28855931 in words is "twenty-eight million, eight hundred fifty-five thousand, nine hundred thirty-one".