812633278 has 4 divisors (see below), whose sum is σ = 1218949920. Its totient is φ = 406316638.

The previous prime is 812633267. The next prime is 812633291. The reversal of 812633278 is 872336218.

It is a semiprime because it is the product of two primes.

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 812633278.

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, 203158318 + ... + 203158321.

It is an arithmetic number, because the mean of its divisors is an integer number (304737480).

Almost surely, 2^812633278 is an apocalyptic number.

812633278 is a deficient number, since it is larger than the sum of its proper divisors (406316642).

812633278 is a wasteful number, since it uses less digits than its factorization.

812633278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406316641.

The product of its digits is 96768, while the sum is 40.

The square root of 812633278 is about 28506.7233823882. The cubic root of 812633278 is about 933.1788081196.

The spelling of 812633278 in words is "eight hundred twelve million, six hundred thirty-three thousand, two hundred seventy-eight".