28743615 has 24 divisors (see below), whose sum is σ = 50027328. Its totient is φ = 15266880.

The previous prime is 28743613. The next prime is 28743619. The reversal of 28743615 is 51634782.

It is not a de Polignac number, because 28743615 - 2¹ = 28743613 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28743615.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28743613) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11017 + ... + 13373.

It is an arithmetic number, because the mean of its divisors is an integer number (2084472).

Almost surely, 2^28743615 is an apocalyptic number.

28743615 is a deficient number, since it is larger than the sum of its proper divisors (21283713).

28743615 is a wasteful number, since it uses less digits than its factorization.

28743615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2639 (or 2636 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 28743615 is about 5361.3072100002. The cubic root of 28743615 is about 306.3236035777.

The spelling of 28743615 in words is "twenty-eight million, seven hundred forty-three thousand, six hundred fifteen".