28146664 has 96 divisors (see below), whose sum is σ = 69471360. Its totient is φ = 10391040.

The previous prime is 28146661. The next prime is 28146689. The reversal of 28146664 is 46664182.

It is not an unprimeable number, because it can be changed into a prime (28146661) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 686484 + ... + 686524.

It is an arithmetic number, because the mean of its divisors is an integer number (723660).

Almost surely, 2^28146664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28146664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34735680).

28146664 is an abundant number, since it is smaller than the sum of its proper divisors (41324696).

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

28146664 is a wasteful number, since it uses less digits than its factorization.

28146664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131 (or 86 counting only the distinct ones).

The product of its digits is 55296, while the sum is 37.

The square root of 28146664 is about 5305.3429672360. The cubic root of 28146664 is about 304.1881625975.

It can be divided in two parts, 2 and 8146664, that added together give a triangular number (8146666 = T₄₀₃₆).

The spelling of 28146664 in words is "twenty-eight million, one hundred forty-six thousand, six hundred sixty-four".