28633890 has 32 divisors (see below), whose sum is σ = 68967360. Its totient is φ = 7608384.

The previous prime is 28633883. The next prime is 28633903. The reversal of 28633890 is 9833682.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7656 + ... + 10764.

It is an arithmetic number, because the mean of its divisors is an integer number (2155230).

Almost surely, 2^28633890 is an apocalyptic number.

28633890 is an abundant number, since it is smaller than the sum of its proper divisors (40333470).

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

28633890 is a wasteful number, since it uses less digits than its factorization.

28633890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3426.

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

The square root of 28633890 is about 5351.0643801023. The cubic root of 28633890 is about 305.9333230775.

The spelling of 28633890 in words is "twenty-eight million, six hundred thirty-three thousand, eight hundred ninety".