28770 has 32 divisors (see below), whose sum is σ = 79488. Its totient is φ = 6528.

The previous prime is 28759. The next prime is 28771. The reversal of 28770 is 7782.

It is a self number, because there is not a number n which added to its sum of digits gives 28770.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 28770.

It is not an unprimeable number, because it can be changed into a prime (28771) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 142 + ... + 278.

It is an arithmetic number, because the mean of its divisors is an integer number (2484).

2²⁸⁷⁷⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28770, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39744).

28770 is an abundant number, since it is smaller than the sum of its proper divisors (50718).

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

28770 is a wasteful number, since it uses less digits than its factorization.

28770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154.

The product of its (nonzero) digits is 784, while the sum is 24.

The square root of 28770 is about 169.6172161073. The cubic root of 28770 is about 30.6417304115.

The spelling of 28770 in words is "twenty-eight thousand, seven hundred seventy".