28661808 has 40 divisors (see below), whose sum is σ = 84621568. Its totient is φ = 8188992.

The previous prime is 28661807. The next prime is 28661819. The reversal of 28661808 is 80816682.

It is not an unprimeable number, because it can be changed into a prime (28661803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42316 + ... + 42987.

Almost surely, 2^28661808 is an apocalyptic number.

28661808 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28661808 is an abundant number, since it is smaller than the sum of its proper divisors (55959760).

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

28661808 is a wasteful number, since it uses less digits than its factorization.

28661808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85321 (or 85315 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 39.

The square root of 28661808 is about 5353.6723844479. The cubic root of 28661808 is about 306.0327189586.

The spelling of 28661808 in words is "twenty-eight million, six hundred sixty-one thousand, eight hundred eight".