28133580 has 24 divisors (see below), whose sum is σ = 78774192. Its totient is φ = 7502272.

The previous prime is 28133569. The next prime is 28133593. The reversal of 28133580 is 8533182.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 234387 + ... + 234506.

It is an arithmetic number, because the mean of its divisors is an integer number (3282258).

Almost surely, 2^28133580 is an apocalyptic number.

28133580 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28133580 is an abundant number, since it is smaller than the sum of its proper divisors (50640612).

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

28133580 is a wasteful number, since it uses less digits than its factorization.

28133580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468905 (or 468903 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 28133580 is about 5304.1097273718. The cubic root of 28133580 is about 304.1410212527.

The spelling of 28133580 in words is "twenty-eight million, one hundred thirty-three thousand, five hundred eighty".