28665984 has 64 divisors (see below), whose sum is σ = 80172000. Its totient is φ = 9050112.

The previous prime is 28665983. The next prime is 28666021. The reversal of 28665984 is 48956682.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28665983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5332 + ... + 9260.

Almost surely, 2^28665984 is an apocalyptic number.

28665984 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 28665984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40086000).

28665984 is an abundant number, since it is smaller than the sum of its proper divisors (51506016).

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

28665984 is a wasteful number, since it uses less digits than its factorization.

28665984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3965 (or 3953 counting only the distinct ones).

The product of its digits is 829440, while the sum is 48.

The square root of 28665984 is about 5354.0623829014. The cubic root of 28665984 is about 306.0475811354.

The spelling of 28665984 in words is "twenty-eight million, six hundred sixty-five thousand, nine hundred eighty-four".