812777028 has 48 divisors (see below), whose sum is σ = 2169444480. Its totient is φ = 232003584.

The previous prime is 812777027. The next prime is 812777057. The reversal of 812777028 is 820777218.

812777028 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (812777027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 99300 + ... + 107172.

It is an arithmetic number, because the mean of its divisors is an integer number (45196760).

Almost surely, 2^812777028 is an apocalyptic number.

It is an amenable number.

812777028 is an abundant number, since it is smaller than the sum of its proper divisors (1356667452).

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

812777028 is a wasteful number, since it uses less digits than its factorization.

812777028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9116 (or 9114 counting only the distinct ones).

The product of its (nonzero) digits is 87808, while the sum is 42.

The square root of 812777028 is about 28509.2446059169. The cubic root of 812777028 is about 933.2338294715.

The spelling of 812777028 in words is "eight hundred twelve million, seven hundred seventy-seven thousand, twenty-eight".