28660290 has 32 divisors (see below), whose sum is σ = 69218496. Its totient is φ = 7594560.

The previous prime is 28660279. The next prime is 28660321. The reversal of 28660290 is 9206682.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1960 + ... + 7820.

It is an arithmetic number, because the mean of its divisors is an integer number (2163078).

Almost surely, 2^28660290 is an apocalyptic number.

28660290 is an abundant number, since it is smaller than the sum of its proper divisors (40558206).

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

28660290 is a wasteful number, since it uses less digits than its factorization.

28660290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6034.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 28660290 is about 5353.5306107278. The cubic root of 28660290 is about 306.0273161142.

The spelling of 28660290 in words is "twenty-eight million, six hundred sixty thousand, two hundred ninety".