809519478 has 32 divisors (see below), whose sum is σ = 1652175360. Its totient is φ = 264370080.

The previous prime is 809519467. The next prime is 809519479. The reversal of 809519478 is 874915908.

It is a super-2 number, since 2×809519478² = 1310643570522784968, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 809519478.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (809519479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55576 + ... + 68612.

It is an arithmetic number, because the mean of its divisors is an integer number (51630480).

Almost surely, 2^809519478 is an apocalyptic number.

809519478 is an abundant number, since it is smaller than the sum of its proper divisors (842655882).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

809519478 is a wasteful number, since it uses less digits than its factorization.

809519478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13252.

The product of its (nonzero) digits is 725760, while the sum is 51.

The square root of 809519478 is about 28452.0557780980. The cubic root of 809519478 is about 931.9853827827.

The spelling of 809519478 in words is "eight hundred nine million, five hundred nineteen thousand, four hundred seventy-eight".