28785388 has 24 divisors (see below), whose sum is σ = 51770880. Its totient is φ = 13999440.

The previous prime is 28785373. The next prime is 28785401. The reversal of 28785388 is 88358782.

It is a super-3 number, since 3×28785388³ (a number of 23 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21795 + ... + 23077.

It is an arithmetic number, because the mean of its divisors is an integer number (2157120).

Almost surely, 2^28785388 is an apocalyptic number.

It is an amenable number.

28785388 is a deficient number, since it is larger than the sum of its proper divisors (22985492).

28785388 is a wasteful number, since it uses less digits than its factorization.

28785388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1437 (or 1435 counting only the distinct ones).

The product of its digits is 860160, while the sum is 49.

The square root of 28785388 is about 5365.2015805559. The cubic root of 28785388 is about 306.4719247738.

The spelling of 28785388 in words is "twenty-eight million, seven hundred eighty-five thousand, three hundred eighty-eight".