28108906 has 32 divisors (see below), whose sum is σ = 49390848. Its totient is φ = 11750400.

The previous prime is 28108889. The next prime is 28108919. The reversal of 28108906 is 60980182.

It is a super-2 number, since 2×28108906² = 1580221193033672, which contains 22 as substring.

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, 145546 + ... + 145738.

It is an arithmetic number, because the mean of its divisors is an integer number (1543464).

Almost surely, 2^28108906 is an apocalyptic number.

28108906 is a deficient number, since it is larger than the sum of its proper divisors (21281942).

28108906 is a wasteful number, since it uses less digits than its factorization.

28108906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 28108906 is about 5301.7832848958. The cubic root of 28108906 is about 304.0520816239.

The spelling of 28108906 in words is "twenty-eight million, one hundred eight thousand, nine hundred six".