28293666 has 8 divisors (see below), whose sum is σ = 56587344. Its totient is φ = 9431220.

The previous prime is 28293659. The next prime is 28293667. The reversal of 28293666 is 66639282.

It is a sphenic number, since it is the product of 3 distinct primes.

28293666 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (28293667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2357800 + ... + 2357811.

It is an arithmetic number, because the mean of its divisors is an integer number (7073418).

Almost surely, 2^28293666 is an apocalyptic number.

28293666 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

28293666 is a wasteful number, since it uses less digits than its factorization.

28293666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4715616.

The product of its digits is 186624, while the sum is 42.

The square root of 28293666 is about 5319.1790719997. The cubic root of 28293666 is about 304.7168060227.

The spelling of 28293666 in words is "twenty-eight million, two hundred ninety-three thousand, six hundred sixty-six".