345720355 has 4 divisors (see below), whose sum is σ = 414864432. Its totient is φ = 276576280.

The previous prime is 345720329. The next prime is 345720359. The reversal of 345720355 is 553027543.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 553027543 = 173 ⋅3196691.

It is a de Polignac number, because none of the positive numbers 2^k-345720355 is a prime.

It is a super-2 number, since 2×345720355² = 239045127722652050, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 345720355.

It is not an unprimeable number, because it can be changed into a prime (345720359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34572031 + ... + 34572040.

It is an arithmetic number, because the mean of its divisors is an integer number (103716108).

Almost surely, 2^345720355 is an apocalyptic number.

345720355 is a deficient number, since it is larger than the sum of its proper divisors (69144077).

345720355 is an equidigital number, since it uses as much as digits as its factorization.

345720355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69144076.

The product of its (nonzero) digits is 63000, while the sum is 34.

The square root of 345720355 is about 18593.5568141225. The cubic root of 345720355 is about 701.8457107153.

Adding to 345720355 its reverse (553027543), we get a palindrome (898747898).

The spelling of 345720355 in words is "three hundred forty-five million, seven hundred twenty thousand, three hundred fifty-five".