28265690 has 16 divisors (see below), whose sum is σ = 51217920. Its totient is φ = 11230800.

The previous prime is 28265681. The next prime is 28265693. The reversal of 28265690 is 9656282.

It is a super-2 number, since 2×28265690² = 1597898462352200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28265693) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7850 + ... + 10869.

It is an arithmetic number, because the mean of its divisors is an integer number (3201120).

Almost surely, 2^28265690 is an apocalyptic number.

28265690 is a deficient number, since it is larger than the sum of its proper divisors (22952230).

28265690 is a wasteful number, since it uses less digits than its factorization.

28265690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18877.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 28265690 is about 5316.5486925260. The cubic root of 28265690 is about 304.6163410330.

The spelling of 28265690 in words is "twenty-eight million, two hundred sixty-five thousand, six hundred ninety".