28293765 has 32 divisors (see below), whose sum is σ = 47001600. Its totient is φ = 14524224.

The previous prime is 28293761. The next prime is 28293767. The reversal of 28293765 is 56739282.

28293765 is nontrivially palindromic in base 12.

It is not a de Polignac number, because 28293765 - 2² = 28293761 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28293761) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 46936 + ... + 47534.

It is an arithmetic number, because the mean of its divisors is an integer number (1468800).

Almost surely, 2^28293765 is an apocalyptic number.

It is an amenable number.

28293765 is a deficient number, since it is larger than the sum of its proper divisors (18707835).

28293765 is a wasteful number, since it uses less digits than its factorization.

28293765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 721.

The product of its digits is 181440, while the sum is 42.

The square root of 28293765 is about 5319.1883779389. The cubic root of 28293765 is about 304.7171614253.

The spelling of 28293765 in words is "twenty-eight million, two hundred ninety-three thousand, seven hundred sixty-five".