85825809 has 24 divisors (see below), whose sum is σ = 132088320. Its totient is φ = 53513088.

The previous prime is 85825801. The next prime is 85825813. The reversal of 85825809 is 90852858.

It is not a de Polignac number, because 85825809 - 2³ = 85825801 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (85825801) 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, 23872 + ... + 27230.

It is an arithmetic number, because the mean of its divisors is an integer number (5503680).

Almost surely, 2^85825809 is an apocalyptic number.

It is an amenable number.

85825809 is a deficient number, since it is larger than the sum of its proper divisors (46262511).

85825809 is a wasteful number, since it uses less digits than its factorization.

85825809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3549 (or 3546 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 45.

The square root of 85825809 is about 9264.2219856823. The cubic root of 85825809 is about 441.1022793297.

It can be divided in two parts, 858 and 25809, that multiplied together give a palindrome (22144122).

The spelling of 85825809 in words is "eighty-five million, eight hundred twenty-five thousand, eight hundred nine".