812271478 has 4 divisors (see below), whose sum is σ = 1218407220. Its totient is φ = 406135738.

The previous prime is 812271463. The next prime is 812271487. The reversal of 812271478 is 874172218.

812271478 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 an emirpimes, since its reverse is a distinct semiprime: 874172218 = 2 ⋅437086109.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 812271478.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203067868 + ... + 203067871.

It is an arithmetic number, because the mean of its divisors is an integer number (304601805).

Almost surely, 2^812271478 is an apocalyptic number.

812271478 is a deficient number, since it is larger than the sum of its proper divisors (406135742).

812271478 is a wasteful number, since it uses less digits than its factorization.

812271478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406135741.

The product of its digits is 50176, while the sum is 40.

The square root of 812271478 is about 28500.3768045266. The cubic root of 812271478 is about 933.0402978305.

The spelling of 812271478 in words is "eight hundred twelve million, two hundred seventy-one thousand, four hundred seventy-eight".