28086669 has 48 divisors (see below), whose sum is σ = 48065472. Its totient is φ = 16236288.

The previous prime is 28086659. The next prime is 28086671. The reversal of 28086669 is 96668082.

It is not a de Polignac number, because 28086669 - 2⁵ = 28086637 is a prime.

It is a super-2 number, since 2×28086669² = 1577721951031122, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28086659) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 53442 + ... + 53964.

It is an arithmetic number, because the mean of its divisors is an integer number (1001364).

Almost surely, 2^28086669 is an apocalyptic number.

It is an amenable number.

28086669 is a deficient number, since it is larger than the sum of its proper divisors (19978803).

28086669 is a wasteful number, since it uses less digits than its factorization.

28086669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 568 (or 556 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The square root of 28086669 is about 5299.6857454004. The cubic root of 28086669 is about 303.9718817772.

The spelling of 28086669 in words is "twenty-eight million, eighty-six thousand, six hundred sixty-nine".