28756980 has 144 divisors (see below), whose sum is σ = 103259520. Its totient is φ = 6338304.

The previous prime is 28756961. The next prime is 28756993. The reversal of 28756980 is 8965782.

28756980 is a `hidden beast` number, since 2 + 8 + 7 + 569 + 80 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 36147 + ... + 36933.

It is an arithmetic number, because the mean of its divisors is an integer number (717080).

Almost surely, 2^28756980 is an apocalyptic number.

28756980 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 28756980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51629760).

28756980 is an abundant number, since it is smaller than the sum of its proper divisors (74502540).

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

28756980 is a wasteful number, since it uses less digits than its factorization.

28756980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 838 (or 833 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The square root of 28756980 is about 5362.5534962367. The cubic root of 28756980 is about 306.3710736053.

The spelling of 28756980 in words is "twenty-eight million, seven hundred fifty-six thousand, nine hundred eighty".