812220036444 has 96 divisors (see below), whose sum is σ = 2238769290240. Its totient is φ = 254082464064.

The previous prime is 812220036443. The next prime is 812220036473. The reversal of 812220036444 is 444630022218.

812220036444 is a `hidden beast` number, since 8 + 1 + 2 + 2 + 2 + 0 + 0 + 3 + 644 + 4 = 666.

812220036444 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 (36).

It is a junction number, because it is equal to n+sod(n) for n = 812220036399 and 812220036408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812220036443) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2953072 + ... + 3216375.

It is an arithmetic number, because the mean of its divisors is an integer number (23320513440).

Almost surely, 2^812220036444 is an apocalyptic number.

It is an amenable number.

812220036444 is an abundant number, since it is smaller than the sum of its proper divisors (1426549253796).

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

812220036444 is a wasteful number, since it uses less digits than its factorization.

812220036444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6169536 (or 6169528 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 36.

The spelling of 812220036444 in words is "eight hundred twelve billion, two hundred twenty million, thirty-six thousand, four hundred forty-four".