811778022 has 24 divisors (see below), whose sum is σ = 1918748520. Its totient is φ = 245993280.

The previous prime is 811778017. The next prime is 811778027. The reversal of 811778022 is 220877118.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (811778017) and next prime (811778027).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (811778027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2049747 + ... + 2050142.

It is an arithmetic number, because the mean of its divisors is an integer number (79947855).

Almost surely, 2^811778022 is an apocalyptic number.

811778022 is an abundant number, since it is smaller than the sum of its proper divisors (1106970498).

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

811778022 is a wasteful number, since it uses less digits than its factorization.

811778022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4099908 (or 4099905 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 36.

The square root of 811778022 is about 28491.7184809902. The cubic root of 811778022 is about 932.8513184842.

The spelling of 811778022 in words is "eight hundred eleven million, seven hundred seventy-eight thousand, twenty-two".