28658580 has 48 divisors (see below), whose sum is σ = 81453120. Its totient is φ = 7527168.

The previous prime is 28658573. The next prime is 28658599. The reversal of 28658580 is 8585682.

It is a super-3 number, since 3×28658580³ (a number of 23 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

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 15 ways as a sum of consecutive naturals, for example, 456 + ... + 7584.

It is an arithmetic number, because the mean of its divisors is an integer number (1696940).

Almost surely, 2^28658580 is an apocalyptic number.

28658580 is a gapful number since it is divisible by the number (20) 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 28658580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40726560).

28658580 is an abundant number, since it is smaller than the sum of its proper divisors (52794540).

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

28658580 is a wasteful number, since it uses less digits than its factorization.

28658580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7208 (or 7206 counting only the distinct ones).

The product of its (nonzero) digits is 153600, while the sum is 42.

The square root of 28658580 is about 5353.3709006569. The cubic root of 28658580 is about 306.0212296775.

The spelling of 28658580 in words is "twenty-eight million, six hundred fifty-eight thousand, five hundred eighty".