28505240806 has 32 divisors (see below), whose sum is σ = 49078149120. Its totient is φ = 12163641696.

The previous prime is 28505240801. The next prime is 28505240837. The reversal of 28505240806 is 60804250582.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28505240801) 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, 3301411 + ... + 3310033.

It is an arithmetic number, because the mean of its divisors is an integer number (1533692160).

Almost surely, 2^28505240806 is an apocalyptic number.

28505240806 is a deficient number, since it is larger than the sum of its proper divisors (20572908314).

28505240806 is a wasteful number, since it uses less digits than its factorization.

28505240806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9628.

The product of its (nonzero) digits is 153600, while the sum is 40.

The spelling of 28505240806 in words is "twenty-eight billion, five hundred five million, two hundred forty thousand, eight hundred six".