28995231 has 8 divisors (see below), whose sum is σ = 38907184. Its totient is φ = 19206720.

The previous prime is 28995223. The next prime is 28995259. The reversal of 28995231 is 13259982.

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

It is not a de Polignac number, because 28995231 - 2³ = 28995223 is a prime.

It is a super-2 number, since 2×28995231² = 1681446841486722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28995231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28995271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30310 + ... + 31251.

It is an arithmetic number, because the mean of its divisors is an integer number (4863398).

Almost surely, 2^28995231 is an apocalyptic number.

28995231 is a deficient number, since it is larger than the sum of its proper divisors (9911953).

28995231 is a wasteful number, since it uses less digits than its factorization.

28995231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61721.

The product of its digits is 38880, while the sum is 39.

The square root of 28995231 is about 5384.7219983951. The cubic root of 28995231 is about 307.2148404052.

The spelling of 28995231 in words is "twenty-eight million, nine hundred ninety-five thousand, two hundred thirty-one".