28765388 has 6 divisors (see below), whose sum is σ = 50339436. Its totient is φ = 14382692.

The previous prime is 28765381. The next prime is 28765403. The reversal of 28765388 is 88356782.

It is not an unprimeable number, because it can be changed into a prime (28765381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3595670 + ... + 3595677.

It is an arithmetic number, because the mean of its divisors is an integer number (8389906).

Almost surely, 2^28765388 is an apocalyptic number.

It is an amenable number.

28765388 is a deficient number, since it is larger than the sum of its proper divisors (21574048).

28765388 is a wasteful number, since it uses less digits than its factorization.

28765388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7191351 (or 7191349 counting only the distinct ones).

The product of its digits is 645120, while the sum is 47.

The square root of 28765388 is about 5363.3373938249. The cubic root of 28765388 is about 306.4009297420.

The spelling of 28765388 in words is "twenty-eight million, seven hundred sixty-five thousand, three hundred eighty-eight".