1720745049 has 8 divisors (see below), whose sum is σ = 2429287200. Its totient is φ = 1079683136.

The previous prime is 1720745041. The next prime is 1720745053. The reversal of 1720745049 is 9405470271.

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 1720745049 - 2³ = 1720745041 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1720744998 and 1720745016.

It is not an unprimeable number, because it can be changed into a prime (1720745041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16869999 + ... + 16870100.

It is an arithmetic number, because the mean of its divisors is an integer number (303660900).

Almost surely, 2^1720745049 is an apocalyptic number.

It is an amenable number.

1720745049 is a deficient number, since it is larger than the sum of its proper divisors (708542151).

1720745049 is a wasteful number, since it uses less digits than its factorization.

1720745049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33740119.

The product of its (nonzero) digits is 70560, while the sum is 39.

The square root of 1720745049 is about 41481.8640974583. The cubic root of 1720745049 is about 1198.3182574137.

The spelling of 1720745049 in words is "one billion, seven hundred twenty million, seven hundred forty-five thousand, forty-nine".