28734817 has 4 divisors (see below), whose sum is σ = 28750276. Its totient is φ = 28719360.

The previous prime is 28734787. The next prime is 28734841. The reversal of 28734817 is 71843782.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71843782 = 2 ⋅35921891.

It can be written as a sum of positive squares in 2 ways, for example, as 6305121 + 22429696 = 2511^2 + 4736^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28734817 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 28734817.

It is not an unprimeable number, because it can be changed into a prime (28734857) 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, 4488 + ... + 8809.

It is an arithmetic number, because the mean of its divisors is an integer number (7187569).

Almost surely, 2^28734817 is an apocalyptic number.

It is an amenable number.

28734817 is a deficient number, since it is larger than the sum of its proper divisors (15459).

28734817 is a wasteful number, since it uses less digits than its factorization.

28734817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15458.

The product of its digits is 75264, while the sum is 40.

The square root of 28734817 is about 5360.4866383566. The cubic root of 28734817 is about 306.2923466640.

The spelling of 28734817 in words is "twenty-eight million, seven hundred thirty-four thousand, eight hundred seventeen".