1720742345 has 8 divisors (see below), whose sum is σ = 2359875264. Its totient is φ = 1179937584.

The previous prime is 1720742341. The next prime is 1720742369. The reversal of 1720742345 is 5432470271.

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

It is not a de Polignac number, because 1720742345 - 2² = 1720742341 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35), and also a Moran number because the ratio is a prime number: 49164067 = 1720742345 / (1 + 7 + 2 + 0 + 7 + 4 + 2 + 3 + 4 + 5).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1720742341) 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, 24581999 + ... + 24582068.

It is an arithmetic number, because the mean of its divisors is an integer number (294984408).

Almost surely, 2^1720742345 is an apocalyptic number.

It is an amenable number.

1720742345 is a deficient number, since it is larger than the sum of its proper divisors (639132919).

1720742345 is an equidigital number, since it uses as much as digits as its factorization.

1720742345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49164079.

The product of its (nonzero) digits is 47040, while the sum is 35.

The square root of 1720742345 is about 41481.8315048890. The cubic root of 1720742345 is about 1198.3176297293.

The spelling of 1720742345 in words is "one billion, seven hundred twenty million, seven hundred forty-two thousand, three hundred forty-five".