28901805 has 16 divisors (see below), whose sum is σ = 47319360. Its totient is φ = 15055488.

The previous prime is 28901797. The next prime is 28901809. The reversal of 28901805 is 50810982.

It is a happy number.

It is not a de Polignac number, because 28901805 - 2³ = 28901797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28901809) 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, 21760 + ... + 23049.

It is an arithmetic number, because the mean of its divisors is an integer number (2957460).

Almost surely, 2^28901805 is an apocalyptic number.

It is an amenable number.

28901805 is a deficient number, since it is larger than the sum of its proper divisors (18417555).

28901805 is a wasteful number, since it uses less digits than its factorization.

28901805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44860.

The product of its (nonzero) digits is 5760, while the sum is 33.

The square root of 28901805 is about 5376.0398994055. The cubic root of 28901805 is about 306.8845247533.

The spelling of 28901805 in words is "twenty-eight million, nine hundred one thousand, eight hundred five".