28531668 has 24 divisors (see below), whose sum is σ = 72626400. Its totient is φ = 8645920.

The previous prime is 28531667. The next prime is 28531691. The reversal of 28531668 is 86613582.

It is a happy number.

It is a super-3 number, since 3×28531668³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28531667) 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, 107943 + ... + 108206.

It is an arithmetic number, because the mean of its divisors is an integer number (3026100).

Almost surely, 2^28531668 is an apocalyptic number.

It is an amenable number.

28531668 is an abundant number, since it is smaller than the sum of its proper divisors (44094732).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28531668 is a wasteful number, since it uses less digits than its factorization.

28531668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216167 (or 216165 counting only the distinct ones).

The product of its digits is 69120, while the sum is 39.

The square root of 28531668 is about 5341.5042825032. The cubic root of 28531668 is about 305.5688318541.

The spelling of 28531668 in words is "twenty-eight million, five hundred thirty-one thousand, six hundred sixty-eight".