28640166 has 32 divisors (see below), whose sum is σ = 58399488. Its totient is φ = 9362400.

The previous prime is 28640147. The next prime is 28640167. The reversal of 28640166 is 66104682.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28640167) 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, 101061 + ... + 101343.

It is an arithmetic number, because the mean of its divisors is an integer number (1824984).

Almost surely, 2^28640166 is an apocalyptic number.

28640166 is an abundant number, since it is smaller than the sum of its proper divisors (29759322).

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

28640166 is a wasteful number, since it uses less digits than its factorization.

28640166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 556.

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 28640166 is about 5351.6507733596. The cubic root of 28640166 is about 305.9556730187.

The spelling of 28640166 in words is "twenty-eight million, six hundred forty thousand, one hundred sixty-six".