28294765 has 16 divisors (see below), whose sum is σ = 34570800. Its totient is φ = 22228992.

The previous prime is 28294757. The next prime is 28294769. The reversal of 28294765 is 56749282.

It can be written as a sum of positive squares in 8 ways, for example, as 3663396 + 24631369 = 1914^2 + 4963^2 .

It is a cyclic number.

It is not a de Polignac number, because 28294765 - 2³ = 28294757 is a prime.

Its product of digits (241920) is a multiple of the sum of its prime divisors (576).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28294769) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 105051 + ... + 105319.

It is an arithmetic number, because the mean of its divisors is an integer number (2160675).

Almost surely, 2^28294765 is an apocalyptic number.

It is an amenable number.

28294765 is a deficient number, since it is larger than the sum of its proper divisors (6276035).

28294765 is a wasteful number, since it uses less digits than its factorization.

28294765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 576.

The product of its digits is 241920, while the sum is 43.

The square root of 28294765 is about 5319.2823764113. The cubic root of 28294765 is about 304.7207513042.

It can be divided in two parts, 28294 and 765, that multiplied together give a triangular number (21644910 = T₆₅₇₉).

The spelling of 28294765 in words is "twenty-eight million, two hundred ninety-four thousand, seven hundred sixty-five".