28785340 has 12 divisors (see below), whose sum is σ = 60449256. Its totient is φ = 11514128.

The previous prime is 28785331. The next prime is 28785347. The reversal of 28785340 is 4358782.

It is a self number, because there is not a number n which added to its sum of digits gives 28785340.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28785347) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 719614 + ... + 719653.

It is an arithmetic number, because the mean of its divisors is an integer number (5037438).

Almost surely, 2^28785340 is an apocalyptic number.

28785340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28785340 is an abundant number, since it is smaller than the sum of its proper divisors (31663916).

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

28785340 is a wasteful number, since it uses less digits than its factorization.

28785340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1439276 (or 1439274 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 37.

The square root of 28785340 is about 5365.1971072832. The cubic root of 28785340 is about 306.4717544251.

The spelling of 28785340 in words is "twenty-eight million, seven hundred eighty-five thousand, three hundred forty".