1720707057 has 12 divisors (see below), whose sum is σ = 2577520400. Its totient is φ = 1147137876.

The previous prime is 1720707047. The next prime is 1720707059. The reversal of 1720707057 is 7507070271.

It is a happy number.

It is not a de Polignac number, because 1720707057 - 2⁴ = 1720707041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1720707059) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3540307 + ... + 3540792.

Almost surely, 2^1720707057 is an apocalyptic number.

It is an amenable number.

1720707057 is a deficient number, since it is larger than the sum of its proper divisors (856813343).

1720707057 is an frugal number, since it uses more digits than its factorization.

1720707057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7081114 (or 7081102 counting only the distinct ones).

The product of its (nonzero) digits is 24010, while the sum is 36.

The square root of 1720707057 is about 41481.4061598688. The cubic root of 1720707057 is about 1198.3094382024.

The spelling of 1720707057 in words is "one billion, seven hundred twenty million, seven hundred seven thousand, fifty-seven".