1720113978 has 24 divisors (see below), whose sum is σ = 3781409184. Its totient is φ = 521246440.

The previous prime is 1720113977. The next prime is 1720114013. The reversal of 1720113978 is 8793110271.

It is not an unprimeable number, because it can be changed into a prime (1720113973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1183926 + ... + 1185377.

It is an arithmetic number, because the mean of its divisors is an integer number (157558716).

Almost surely, 2^1720113978 is an apocalyptic number.

1720113978 is an abundant number, since it is smaller than the sum of its proper divisors (2061295206).

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

1720113978 is a wasteful number, since it uses less digits than its factorization.

1720113978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2369330 (or 2369319 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 39.

The square root of 1720113978 is about 41474.2568107013. The cubic root of 1720113978 is about 1198.1717479377.

The spelling of 1720113978 in words is "one billion, seven hundred twenty million, one hundred thirteen thousand, nine hundred seventy-eight".