1720661152 has 48 divisors (see below), whose sum is σ = 3882453120. Its totient is φ = 735337728.

The previous prime is 1720661143. The next prime is 1720661153. The reversal of 1720661152 is 2511660271.

It is not an unprimeable number, because it can be changed into a prime (1720661153) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69718 + ... + 91114.

It is an arithmetic number, because the mean of its divisors is an integer number (80884440).

Almost surely, 2^1720661152 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 1720661152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1941226560).

1720661152 is an abundant number, since it is smaller than the sum of its proper divisors (2161791968).

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

1720661152 is a wasteful number, since it uses less digits than its factorization.

1720661152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21773 (or 21765 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 1720661152 is about 41480.8528359772. The cubic root of 1720661152 is about 1198.2987819466.

The spelling of 1720661152 in words is "one billion, seven hundred twenty million, six hundred sixty-one thousand, one hundred fifty-two".