1720796639 has 8 divisors (see below), whose sum is σ = 1783068672. Its totient is φ = 1658947320.

The previous prime is 1720796621. The next prime is 1720796647. The reversal of 1720796639 is 9366970271.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1720796639 - 2¹² = 1720792543 is a prime.

It is a super-2 number, since 2×1720796639² = 5922282145587392642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1720796239) 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 7 ways as a sum of consecutive naturals, for example, 97379 + ... + 113684.

It is an arithmetic number, because the mean of its divisors is an integer number (222883584).

Almost surely, 2^1720796639 is an apocalyptic number.

1720796639 is a deficient number, since it is larger than the sum of its proper divisors (62272033).

1720796639 is a wasteful number, since it uses less digits than its factorization.

1720796639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211357.

The product of its (nonzero) digits is 857304, while the sum is 50.

The square root of 1720796639 is about 41482.4859308118. The cubic root of 1720796639 is about 1198.3302329668.

The spelling of 1720796639 in words is "one billion, seven hundred twenty million, seven hundred ninety-six thousand, six hundred thirty-nine".