1720724263 has 4 divisors (see below), whose sum is σ = 1744959888. Its totient is φ = 1696488640.

The previous prime is 1720724233. The next prime is 1720724279. The reversal of 1720724263 is 3624270271.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1720724263 - 2⁹ = 1720723751 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1720724233) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12117706 + ... + 12117847.

It is an arithmetic number, because the mean of its divisors is an integer number (436239972).

Almost surely, 2^1720724263 is an apocalyptic number.

1720724263 is a deficient number, since it is larger than the sum of its proper divisors (24235625).

1720724263 is an equidigital number, since it uses as much as digits as its factorization.

1720724263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24235624.

The product of its (nonzero) digits is 28224, while the sum is 34.

The square root of 1720724263 is about 41481.6135534769. The cubic root of 1720724263 is about 1198.3134323054.

The spelling of 1720724263 in words is "one billion, seven hundred twenty million, seven hundred twenty-four thousand, two hundred sixty-three".