345020520 has 128 divisors (see below), whose sum is σ = 1131661440. Its totient is φ = 83635200.

The previous prime is 345020509. The next prime is 345020521. The reversal of 345020520 is 25020543.

345020520 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (345020521) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 102870 + ... + 106170.

It is an arithmetic number, because the mean of its divisors is an integer number (8841105).

Almost surely, 2^345020520 is an apocalyptic number.

345020520 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 345020520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (565830720).

345020520 is an abundant number, since it is smaller than the sum of its proper divisors (786640920).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

345020520 is a wasteful number, since it uses less digits than its factorization.

345020520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3395 (or 3391 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 21.

The square root of 345020520 is about 18574.7279926248. The cubic root of 345020520 is about 701.3718132572.

The spelling of 345020520 in words is "three hundred forty-five million, twenty thousand, five hundred twenty".