28788749 has 8 divisors (see below), whose sum is σ = 31583520. Its totient is φ = 26023600.

The previous prime is 28788719. The next prime is 28788763. The reversal of 28788749 is 94788782.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28788749 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28788749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28788719) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5342 + ... + 9279.

It is an arithmetic number, because the mean of its divisors is an integer number (3947940).

Almost surely, 2^28788749 is an apocalyptic number.

It is an amenable number.

28788749 is a deficient number, since it is larger than the sum of its proper divisors (2794771).

28788749 is a wasteful number, since it uses less digits than its factorization.

28788749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14811.

The product of its digits is 1806336, while the sum is 53.

The square root of 28788749 is about 5365.5147935683. The cubic root of 28788749 is about 306.4838522612.

The spelling of 28788749 in words is "twenty-eight million, seven hundred eighty-eight thousand, seven hundred forty-nine".