28167906 has 24 divisors (see below), whose sum is σ = 61004880. Its totient is φ = 8666736.

The previous prime is 28167869. The next prime is 28167907. The reversal of 28167906 is 60976182.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28167907) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12876 + ... + 14903.

It is an arithmetic number, because the mean of its divisors is an integer number (2541870).

Almost surely, 2^28167906 is an apocalyptic number.

28167906 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

28167906 is an abundant number, since it is smaller than the sum of its proper divisors (32836974).

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

28167906 is a wasteful number, since it uses less digits than its factorization.

28167906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27810 (or 27797 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 28167906 is about 5307.3445337570. The cubic root of 28167906 is about 304.2646659223.

The spelling of 28167906 in words is "twenty-eight million, one hundred sixty-seven thousand, nine hundred six".