28068669 has 6 divisors (see below), whose sum is σ = 40543646. Its totient is φ = 18712440.

The previous prime is 28068629. The next prime is 28068679. The reversal of 28068669 is 96686082.

It can be written as a sum of positive squares in only one way, i.e., 27436644 + 632025 = 5238^2 + 795^2 .

It is not a de Polignac number, because 28068669 - 2⁸ = 28068413 is a prime.

It is a super-2 number, since 2×28068669² = 1575700358863122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28068619) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1559362 + ... + 1559379.

Almost surely, 2^28068669 is an apocalyptic number.

It is an amenable number.

28068669 is a deficient number, since it is larger than the sum of its proper divisors (12474977).

28068669 is a wasteful number, since it uses less digits than its factorization.

28068669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3118747 (or 3118744 counting only the distinct ones).

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

The square root of 28068669 is about 5297.9872593278. The cubic root of 28068669 is about 303.9069320658.

The spelling of 28068669 in words is "twenty-eight million, sixty-eight thousand, six hundred sixty-nine".