28086172 has 6 divisors (see below), whose sum is σ = 49150808. Its totient is φ = 14043084.

The previous prime is 28086137. The next prime is 28086203. The reversal of 28086172 is 27168082.

28086172 is nontrivially palindromic in base 5.

It is a super-2 number, since 2×28086172² = 1577666115227168, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3510768 + ... + 3510775.

Almost surely, 2^28086172 is an apocalyptic number.

It is an amenable number.

28086172 is a deficient number, since it is larger than the sum of its proper divisors (21064636).

28086172 is a wasteful number, since it uses less digits than its factorization.

28086172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7021547 (or 7021545 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 28086172 is about 5299.6388556203. The cubic root of 28086172 is about 303.9700888161.

The spelling of 28086172 in words is "twenty-eight million, eighty-six thousand, one hundred seventy-two".