28783388 has 6 divisors (see below), whose sum is σ = 50370936. Its totient is φ = 14391692.

The previous prime is 28783387. The next prime is 28783393. The reversal of 28783388 is 88338782.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28783387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3597920 + ... + 3597927.

It is an arithmetic number, because the mean of its divisors is an integer number (8395156).

Almost surely, 2^28783388 is an apocalyptic number.

It is an amenable number.

28783388 is a deficient number, since it is larger than the sum of its proper divisors (21587548).

28783388 is a wasteful number, since it uses less digits than its factorization.

28783388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7195851 (or 7195849 counting only the distinct ones).

The product of its digits is 516096, while the sum is 47.

The square root of 28783388 is about 5365.0151910316. The cubic root of 28783388 is about 306.4648267508.

The spelling of 28783388 in words is "twenty-eight million, seven hundred eighty-three thousand, three hundred eighty-eight".