28587320 has 32 divisors (see below), whose sum is σ = 64761120. Its totient is φ = 11356800.

The previous prime is 28587287. The next prime is 28587323. The reversal of 28587320 is 2378582.

It is a happy number.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28587323) 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, 3674 + ... + 8406.

It is an arithmetic number, because the mean of its divisors is an integer number (2023785).

Almost surely, 2^28587320 is an apocalyptic number.

28587320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28587320 is an abundant number, since it is smaller than the sum of its proper divisors (36173800).

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

28587320 is a wasteful number, since it uses less digits than its factorization.

28587320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4895 (or 4891 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 28587320 is about 5346.7111386347. The cubic root of 28587320 is about 305.7673769933.

The spelling of 28587320 in words is "twenty-eight million, five hundred eighty-seven thousand, three hundred twenty".