28292805 has 24 divisors (see below), whose sum is σ = 51623520. Its totient is φ = 14294880.

The previous prime is 28292773. The next prime is 28292807. The reversal of 28292805 is 50829282.

It is not a de Polignac number, because 28292805 - 2⁵ = 28292773 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28292805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28292807) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15691 + ... + 17400.

It is an arithmetic number, because the mean of its divisors is an integer number (2150980).

Almost surely, 2^28292805 is an apocalyptic number.

It is an amenable number.

28292805 is a deficient number, since it is larger than the sum of its proper divisors (23330715).

28292805 is a wasteful number, since it uses less digits than its factorization.

28292805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33121 (or 33118 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 28292805 is about 5319.0981378425. The cubic root of 28292805 is about 304.7137150620.

The spelling of 28292805 in words is "twenty-eight million, two hundred ninety-two thousand, eight hundred five".