28666290 has 32 divisors (see below), whose sum is σ = 69169536. Its totient is φ = 7603200.

The previous prime is 28666283. The next prime is 28666327. The reversal of 28666290 is 9266682.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3315 + ... + 8265.

It is an arithmetic number, because the mean of its divisors is an integer number (2161548).

Almost surely, 2^28666290 is an apocalyptic number.

28666290 is an abundant number, since it is smaller than the sum of its proper divisors (40503246).

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

28666290 is a wasteful number, since it uses less digits than its factorization.

28666290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5154.

The product of its (nonzero) digits is 62208, while the sum is 39.

The square root of 28666290 is about 5354.0909592572. The cubic root of 28666290 is about 306.0486701174.

The spelling of 28666290 in words is "twenty-eight million, six hundred sixty-six thousand, two hundred ninety".