28675649 has 4 divisors (see below), whose sum is σ = 28834260. Its totient is φ = 28517040.

The previous prime is 28675643. The next prime is 28675663. The reversal of 28675649 is 94657682.

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

It can be written as a sum of positive squares in 2 ways, for example, as 15484225 + 13191424 = 3935^2 + 3632^2 .

It is a cyclic number.

It is not a de Polignac number, because 28675649 - 2²⁴ = 11898433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28675643) 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, 79034 + ... + 79395.

It is an arithmetic number, because the mean of its divisors is an integer number (7208565).

Almost surely, 2^28675649 is an apocalyptic number.

It is an amenable number.

28675649 is a deficient number, since it is larger than the sum of its proper divisors (158611).

28675649 is a wasteful number, since it uses less digits than its factorization.

28675649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158610.

The product of its digits is 725760, while the sum is 47.

The square root of 28675649 is about 5354.9648925086. The cubic root of 28675649 is about 306.0819728555.

The spelling of 28675649 in words is "twenty-eight million, six hundred seventy-five thousand, six hundred forty-nine".