345442220 has 96 divisors (see below), whose sum is σ = 775849536. Its totient is φ = 129024000.

The previous prime is 345442199. The next prime is 345442241. The reversal of 345442220 is 22244543.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (345442199) and next prime (345442241).

It is a self number, because there is not a number n which added to its sum of digits gives 345442220.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3420170 + ... + 3420270.

It is an arithmetic number, because the mean of its divisors is an integer number (8081766).

Almost surely, 2^345442220 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 345442220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (387924768).

345442220 is an abundant number, since it is smaller than the sum of its proper divisors (430407316).

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

345442220 is a wasteful number, since it uses less digits than its factorization.

345442220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291 (or 289 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 26.

The square root of 345442220 is about 18586.0759710058. The cubic root of 345442220 is about 701.6574465820.

Adding to 345442220 its reverse (22244543), we get a palindrome (367686763).

The spelling of 345442220 in words is "three hundred forty-five million, four hundred forty-two thousand, two hundred twenty".