28784990 has 32 divisors (see below), whose sum is σ = 56155680. Its totient is φ = 10560384.

The previous prime is 28784971. The next prime is 28784999. The reversal of 28784990 is 9948782.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28784999) 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, 22652 + ... + 23888.

It is an arithmetic number, because the mean of its divisors is an integer number (1754865).

Almost surely, 2^28784990 is an apocalyptic number.

28784990 is a deficient number, since it is larger than the sum of its proper divisors (27370690).

28784990 is a wasteful number, since it uses less digits than its factorization.

28784990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1436.

The product of its (nonzero) digits is 290304, while the sum is 47.

The square root of 28784990 is about 5365.1644895567. The cubic root of 28784990 is about 306.4705122934.

The spelling of 28784990 in words is "twenty-eight million, seven hundred eighty-four thousand, nine hundred ninety".