28765693 has 6 divisors (see below), whose sum is σ = 31618622. Its totient is φ = 26150520.

The previous prime is 28765679. The next prime is 28765703. The reversal of 28765693 is 39656782.

It can be written as a sum of positive squares in only one way, i.e., 17656804 + 11108889 = 4202^2 + 3333^2 .

It is not a de Polignac number, because 28765693 - 2⁵ = 28765661 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 (28765603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 118746 + ... + 118987.

Almost surely, 2^28765693 is an apocalyptic number.

It is an amenable number.

28765693 is a deficient number, since it is larger than the sum of its proper divisors (2852929).

28765693 is a wasteful number, since it uses less digits than its factorization.

28765693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237755 (or 237744 counting only the distinct ones).

The product of its digits is 544320, while the sum is 46.

The square root of 28765693 is about 5363.3658275378. The cubic root of 28765693 is about 306.4020126633.

The spelling of 28765693 in words is "twenty-eight million, seven hundred sixty-five thousand, six hundred ninety-three".