28158320 has 40 divisors (see below), whose sum is σ = 65690736. Its totient is φ = 11225088.

The previous prime is 28158289. The next prime is 28158337. The reversal of 28158320 is 2385182.

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

It is a congruent number.

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, 41504 + ... + 42176.

Almost surely, 2^28158320 is an apocalyptic number.

28158320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28158320 is an abundant number, since it is smaller than the sum of its proper divisors (37532416).

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

28158320 is a wasteful number, since it uses less digits than its factorization.

28158320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1209 (or 1203 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 28158320 is about 5306.4413687518. The cubic root of 28158320 is about 304.2301465889.

The spelling of 28158320 in words is "twenty-eight million, one hundred fifty-eight thousand, three hundred twenty".