28493765 has 4 divisors (see below), whose sum is σ = 34192524. Its totient is φ = 22795008.

The previous prime is 28493761. The next prime is 28493767. The reversal of 28493765 is 56739482.

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 5750404 + 22743361 = 2398^2 + 4769^2 .

It is a cyclic number.

It is not a de Polignac number, because 28493765 - 2² = 28493761 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 (28493761) 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, 2849372 + ... + 2849381.

It is an arithmetic number, because the mean of its divisors is an integer number (8548131).

Almost surely, 2^28493765 is an apocalyptic number.

It is an amenable number.

28493765 is a deficient number, since it is larger than the sum of its proper divisors (5698759).

28493765 is an equidigital number, since it uses as much as digits as its factorization.

28493765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5698758.

The product of its digits is 362880, while the sum is 44.

The square root of 28493765 is about 5337.9551328201. The cubic root of 28493765 is about 305.4334605429.

It can be divided in two parts, 284 and 93765, that added together give a palindrome (94049).

The spelling of 28493765 in words is "twenty-eight million, four hundred ninety-three thousand, seven hundred sixty-five".