28366881 has 8 divisors (see below), whose sum is σ = 38247840. Its totient is φ = 18698592.

The previous prime is 28366831. The next prime is 28366883. The reversal of 28366881 is 18866382.

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

It is not a de Polignac number, because 28366881 - 2⁶ = 28366817 is a prime.

It is a super-2 number, since 2×28366881² = 1609359875336322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28366883) 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, 52855 + ... + 53388.

It is an arithmetic number, because the mean of its divisors is an integer number (4780980).

Almost surely, 2^28366881 is an apocalyptic number.

It is an amenable number.

28366881 is a deficient number, since it is larger than the sum of its proper divisors (9880959).

28366881 is a wasteful number, since it uses less digits than its factorization.

28366881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106335.

The product of its digits is 110592, while the sum is 42.

The square root of 28366881 is about 5326.0567965428. The cubic root of 28366881 is about 304.9794163301.

The spelling of 28366881 in words is "twenty-eight million, three hundred sixty-six thousand, eight hundred eighty-one".