1720225836 has 240 divisors, whose sum is σ = 5438146560. Its totient is φ = 463760640.

The previous prime is 1720225831. The next prime is 1720225847. The reversal of 1720225836 is 6385220271.

1720225836 is a `hidden beast` number, since 1 + 72 + 0 + 2 + 2 + 583 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 1720225836.

It is not an unprimeable number, because it can be changed into a prime (1720225831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 3022960 + ... + 3023528.

It is an arithmetic number, because the mean of its divisors is an integer number (22658944).

Almost surely, 2^1720225836 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1720225836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2719073280).

1720225836 is an abundant number, since it is smaller than the sum of its proper divisors (3717920724).

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

1720225836 is a wasteful number, since it uses less digits than its factorization.

1720225836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 666 (or 655 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 1720225836 is about 41475.6053120385. The cubic root of 1720225836 is about 1198.1977195093.

The spelling of 1720225836 in words is "one billion, seven hundred twenty million, two hundred twenty-five thousand, eight hundred thirty-six".