28923613 has 4 divisors (see below), whose sum is σ = 30625020. Its totient is φ = 27222208.

The previous prime is 28923607. The next prime is 28923617. The reversal of 28923613 is 31632982.

It is a happy number.

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 22638564 + 6285049 = 4758^2 + 2507^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28923613 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 (28923617) 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, 850678 + ... + 850711.

It is an arithmetic number, because the mean of its divisors is an integer number (7656255).

Almost surely, 2^28923613 is an apocalyptic number.

It is an amenable number.

28923613 is a deficient number, since it is larger than the sum of its proper divisors (1701407).

28923613 is a wasteful number, since it uses less digits than its factorization.

28923613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1701406.

The product of its digits is 15552, while the sum is 34.

The square root of 28923613 is about 5378.0677756979. The cubic root of 28923613 is about 306.9616924265.

The spelling of 28923613 in words is "twenty-eight million, nine hundred twenty-three thousand, six hundred thirteen".