28180668 has 24 divisors (see below), whose sum is σ = 66200400. Its totient is φ = 9329920.

The previous prime is 28180661. The next prime is 28180673. The reversal of 28180668 is 86608182.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28180661) 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, 6093 + ... + 9668.

It is an arithmetic number, because the mean of its divisors is an integer number (2758350).

Almost surely, 2^28180668 is an apocalyptic number.

It is an amenable number.

28180668 is an abundant number, since it is smaller than the sum of its proper divisors (38019732).

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

28180668 is a wasteful number, since it uses less digits than its factorization.

28180668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15917 (or 15915 counting only the distinct ones).

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

The square root of 28180668 is about 5308.5466937760. The cubic root of 28180668 is about 304.3106099291.

The spelling of 28180668 in words is "twenty-eight million, one hundred eighty thousand, six hundred sixty-eight".