28328664 has 192 divisors, whose sum is σ = 94802400. Its totient is φ = 6967296.

The previous prime is 28328633. The next prime is 28328683. The reversal of 28328664 is 46682382.

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

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 259842 + ... + 259950.

Almost surely, 2^28328664 is an apocalyptic number.

28328664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28328664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47401200).

28328664 is an abundant number, since it is smaller than the sum of its proper divisors (66473736).

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

28328664 is a wasteful number, since it uses less digits than its factorization.

28328664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162 (or 151 counting only the distinct ones).

The product of its digits is 110592, while the sum is 39.

The square root of 28328664 is about 5322.4678486582. The cubic root of 28328664 is about 304.8423946101.

The spelling of 28328664 in words is "twenty-eight million, three hundred twenty-eight thousand, six hundred sixty-four".