28667280 has 40 divisors (see below), whose sum is σ = 88869312. Its totient is φ = 7644544.

The previous prime is 28667279. The next prime is 28667291. The reversal of 28667280 is 8276682.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59484 + ... + 59963.

Almost surely, 2^28667280 is an apocalyptic number.

28667280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28667280 is an abundant number, since it is smaller than the sum of its proper divisors (60202032).

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

28667280 is a wasteful number, since it uses less digits than its factorization.

28667280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119463 (or 119457 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 39.

The square root of 28667280 is about 5354.1834111282. The cubic root of 28667280 is about 306.0521932416.

The spelling of 28667280 in words is "twenty-eight million, six hundred sixty-seven thousand, two hundred eighty".