28166445 has 48 divisors (see below), whose sum is σ = 51377664. Its totient is φ = 14256000.

The previous prime is 28166407. The next prime is 28166447. The reversal of 28166445 is 54466182.

28166445 is a `hidden beast` number, since 2 + 8 + 1 + 6 + 644 + 5 = 666.

It is not a de Polignac number, because 28166445 - 2⁶ = 28166381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28166447) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 84930 + ... + 85260.

It is an arithmetic number, because the mean of its divisors is an integer number (1070368).

Almost surely, 2^28166445 is an apocalyptic number.

It is an amenable number.

28166445 is a deficient number, since it is larger than the sum of its proper divisors (23211219).

28166445 is a wasteful number, since it uses less digits than its factorization.

28166445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434 (or 431 counting only the distinct ones).

The product of its digits is 46080, while the sum is 36.

The square root of 28166445 is about 5307.2068925189. The cubic root of 28166445 is about 304.2594053448.

It can be divided in two parts, 2816 and 6445, that added together give a cube (9261 = 21³).

The spelling of 28166445 in words is "twenty-eight million, one hundred sixty-six thousand, four hundred forty-five".