28744615 has 4 divisors (see below), whose sum is σ = 34493544. Its totient is φ = 22995688.

The previous prime is 28744571. The next prime is 28744619. The reversal of 28744615 is 51644782.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28744615 - 2⁷ = 28744487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28744619) 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, 2874457 + ... + 2874466.

It is an arithmetic number, because the mean of its divisors is an integer number (8623386).

Almost surely, 2^28744615 is an apocalyptic number.

28744615 is a deficient number, since it is larger than the sum of its proper divisors (5748929).

28744615 is an equidigital number, since it uses as much as digits as its factorization.

28744615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5748928.

The product of its digits is 53760, while the sum is 37.

The square root of 28744615 is about 5361.4004700265. The cubic root of 28744615 is about 306.3271559035.

The spelling of 28744615 in words is "twenty-eight million, seven hundred forty-four thousand, six hundred fifteen".