1720768361 has 16 divisors (see below), whose sum is σ = 1917185424. Its totient is φ = 1534132224.

The previous prime is 1720768333. The next prime is 1720768363. The reversal of 1720768361 is 1638670271.

It can be written as a sum of positive squares in 8 ways, for example, as 34105600 + 1686662761 = 5840^2 + 41069^2 .

It is a cyclic number.

It is not a de Polignac number, because 1720768361 - 2¹⁸ = 1720506217 is a prime.

It is a super-2 number, since 2×1720768361² = 5922087504437252642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1720768363) 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, 52841 + ... + 78953.

It is an arithmetic number, because the mean of its divisors is an integer number (119824089).

Almost surely, 2^1720768361 is an apocalyptic number.

It is an amenable number.

1720768361 is a deficient number, since it is larger than the sum of its proper divisors (196417063).

1720768361 is a wasteful number, since it uses less digits than its factorization.

1720768361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26300.

The product of its (nonzero) digits is 84672, while the sum is 41.

The square root of 1720768361 is about 41482.1450867720. The cubic root of 1720768361 is about 1198.3236688427.

The spelling of 1720768361 in words is "one billion, seven hundred twenty million, seven hundred sixty-eight thousand, three hundred sixty-one".