1980717640 has 64 divisors (see below), whose sum is σ = 4876148160. Its totient is φ = 718129920.

The previous prime is 1980717587. The next prime is 1980717647. The reversal of 1980717640 is 467170891.

It is not an unprimeable number, because it can be changed into a prime (1980717647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 146194 + ... + 159166.

It is an arithmetic number, because the mean of its divisors is an integer number (76189815).

Almost surely, 2^1980717640 is an apocalyptic number.

1980717640 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 1980717640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2438074080).

1980717640 is an abundant number, since it is smaller than the sum of its proper divisors (2895430520).

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

1980717640 is a wasteful number, since it uses less digits than its factorization.

1980717640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13342 (or 13338 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 43.

The square root of 1980717640 is about 44505.2540718509. The cubic root of 1980717640 is about 1255.8589253561.

The spelling of 1980717640 in words is "one billion, nine hundred eighty million, seven hundred seventeen thousand, six hundred forty".