28740649 has 8 divisors (see below), whose sum is σ = 33049280. Its totient is φ = 24482736.

The previous prime is 28740637. The next prime is 28740667. The reversal of 28740649 is 94604782.

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

It is a cyclic number.

It is not a de Polignac number, because 28740649 - 2¹¹ = 28738601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28741649) 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, 11454 + ... + 13735.

It is an arithmetic number, because the mean of its divisors is an integer number (4131160).

Almost surely, 2^28740649 is an apocalyptic number.

It is an amenable number.

28740649 is a deficient number, since it is larger than the sum of its proper divisors (4308631).

28740649 is a wasteful number, since it uses less digits than its factorization.

28740649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25359.

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 28740649 is about 5361.0305912203. The cubic root of 28740649 is about 306.3130668950.

The spelling of 28740649 in words is "twenty-eight million, seven hundred forty thousand, six hundred forty-nine".