28925813 has 4 divisors (see below), whose sum is σ = 33058080. Its totient is φ = 24793548.

The previous prime is 28925807. The next prime is 28925833. The reversal of 28925813 is 31852982.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28925813 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28925833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2066123 + ... + 2066136.

It is an arithmetic number, because the mean of its divisors is an integer number (8264520).

Almost surely, 2^28925813 is an apocalyptic number.

It is an amenable number.

28925813 is a deficient number, since it is larger than the sum of its proper divisors (4132267).

28925813 is an equidigital number, since it uses as much as digits as its factorization.

28925813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4132266.

The product of its digits is 34560, while the sum is 38.

The square root of 28925813 is about 5378.2723062337. The cubic root of 28925813 is about 306.9694749789.

The spelling of 28925813 in words is "twenty-eight million, nine hundred twenty-five thousand, eight hundred thirteen".