28102906 has 32 divisors (see below), whose sum is σ = 47190528. Its totient is φ = 12467520.

The previous prime is 28102903. The next prime is 28102909. The reversal of 28102906 is 60920182.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28102903) and next prime (28102909).

It is a Smith number, since the sum of its digits (28) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (28102903) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 125911 + ... + 126133.

It is an arithmetic number, because the mean of its divisors is an integer number (1474704).

Almost surely, 2^28102906 is an apocalyptic number.

28102906 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

28102906 is a deficient number, since it is larger than the sum of its proper divisors (19087622).

28102906 is a wasteful number, since it uses less digits than its factorization.

28102906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 28102906 is about 5301.2174073509. The cubic root of 28102906 is about 304.0304462235.

The spelling of 28102906 in words is "twenty-eight million, one hundred two thousand, nine hundred six".