28305980 has 24 divisors (see below), whose sum is σ = 59684688. Its totient is φ = 11276288.

The previous prime is 28305971. The next prime is 28305983. The reversal of 28305980 is 8950382.

It is a self number, because there is not a number n which added to its sum of digits gives 28305980.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28305983) 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, 2387 + ... + 7893.

It is an arithmetic number, because the mean of its divisors is an integer number (2486862).

Almost surely, 2^28305980 is an apocalyptic number.

28305980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28305980 is an abundant number, since it is smaller than the sum of its proper divisors (31378708).

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

28305980 is a wasteful number, since it uses less digits than its factorization.

28305980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5773 (or 5771 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 28305980 is about 5320.3364555261. The cubic root of 28305980 is about 304.7610060040.

The spelling of 28305980 in words is "twenty-eight million, three hundred five thousand, nine hundred eighty".