28169946 has 48 divisors (see below), whose sum is σ = 70200000. Its totient is φ = 7997184.

The previous prime is 28169903. The next prime is 28169971. The reversal of 28169946 is 64996182.

It is a happy number.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21930 + ... + 23178.

It is an arithmetic number, because the mean of its divisors is an integer number (1462500).

Almost surely, 2^28169946 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28169946, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35100000).

28169946 is an abundant number, since it is smaller than the sum of its proper divisors (42030054).

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

28169946 is a wasteful number, since it uses less digits than its factorization.

28169946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1443 (or 1440 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 28169946 is about 5307.5367167830. The cubic root of 28169946 is about 304.2720109830.

The spelling of 28169946 in words is "twenty-eight million, one hundred sixty-nine thousand, nine hundred forty-six".