1720661160 has 128 divisors (see below), whose sum is σ = 5270376960. Its totient is φ = 449280000.

The previous prime is 1720661153. The next prime is 1720661167. The reversal of 1720661160 is 611660271.

It is an interprime number because it is at equal distance from previous prime (1720661153) and next prime (1720661167).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (1720661167) 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, 2290785 + ... + 2291535.

It is an arithmetic number, because the mean of its divisors is an integer number (41174820).

Almost surely, 2^1720661160 is an apocalyptic number.

1720661160 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1720661160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2635188480).

1720661160 is an abundant number, since it is smaller than the sum of its proper divisors (3549715800).

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

1720661160 is a wasteful number, since it uses less digits than its factorization.

1720661160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1139 (or 1135 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 1720661160 is about 41480.8529324073. The cubic root of 1720661160 is about 1198.2987838037.

The spelling of 1720661160 in words is "one billion, seven hundred twenty million, six hundred sixty-one thousand, one hundred sixty".