827472809 has 4 divisors (see below), whose sum is σ = 832427904. Its totient is φ = 822517716.

The previous prime is 827472803. The next prime is 827472827. The reversal of 827472809 is 908274728.

It is a happy number.

827472809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-827472809 is a prime.

It is a super-2 number, since 2×827472809² = 1369422499268700962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (827472803) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2477297 + ... + 2477630.

It is an arithmetic number, because the mean of its divisors is an integer number (208106976).

Almost surely, 2^827472809 is an apocalyptic number.

It is an amenable number.

827472809 is a deficient number, since it is larger than the sum of its proper divisors (4955095).

827472809 is a wasteful number, since it uses less digits than its factorization.

827472809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4955094.

The product of its (nonzero) digits is 451584, while the sum is 47.

The square root of 827472809 is about 28765.8271043959. The cubic root of 827472809 is about 938.8248514697.

The spelling of 827472809 in words is "eight hundred twenty-seven million, four hundred seventy-two thousand, eight hundred nine".