28740849 has 4 divisors (see below), whose sum is σ = 38321136. Its totient is φ = 19160564.

The previous prime is 28740799. The next prime is 28740851. The reversal of 28740849 is 94804782.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28740849 - 2⁷ = 28740721 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28740849.

It is not an unprimeable number, because it can be changed into a prime (28740889) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4790139 + ... + 4790144.

It is an arithmetic number, because the mean of its divisors is an integer number (9580284).

Almost surely, 2^28740849 is an apocalyptic number.

It is an amenable number.

28740849 is a deficient number, since it is larger than the sum of its proper divisors (9580287).

28740849 is an equidigital number, since it uses as much as digits as its factorization.

28740849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9580286.

The product of its (nonzero) digits is 129024, while the sum is 42.

The square root of 28740849 is about 5361.0492443178. The cubic root of 28740849 is about 306.3137774156.

The spelling of 28740849 in words is "twenty-eight million, seven hundred forty thousand, eight hundred forty-nine".