1720268940 has 96 divisors (see below), whose sum is σ = 5260502016. Its totient is φ = 417473280.

The previous prime is 1720268917. The next prime is 1720268941. The reversal of 1720268940 is 498620271.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (1720268941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 39849 + ... + 70911.

It is an arithmetic number, because the mean of its divisors is an integer number (54796896).

Almost surely, 2^1720268940 is an apocalyptic number.

1720268940 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 1720268940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2630251008).

1720268940 is an abundant number, since it is smaller than the sum of its proper divisors (3540233076).

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

1720268940 is a wasteful number, since it uses less digits than its factorization.

1720268940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31159 (or 31157 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 1720268940 is about 41476.1249395360. The cubic root of 1720268940 is about 1198.2077272424.

The spelling of 1720268940 in words is "one billion, seven hundred twenty million, two hundred sixty-eight thousand, nine hundred forty".