345647380 has 48 divisors (see below), whose sum is σ = 783674640. Its totient is φ = 127300608.

The previous prime is 345647371. The next prime is 345647399. The reversal of 345647380 is 83746543.

It can be written as a sum of positive squares in 8 ways, for example, as 7160976 + 338486404 = 2676^2 + 18398^2 .

It is a super-2 number, since 2×345647380² = 238944222601728800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 117366 + ... + 120274.

It is an arithmetic number, because the mean of its divisors is an integer number (16326555).

Almost surely, 2^345647380 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 345647380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (391837320).

345647380 is an abundant number, since it is smaller than the sum of its proper divisors (438027260).

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

345647380 is a wasteful number, since it uses less digits than its factorization.

345647380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3388 (or 3386 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 40.

The square root of 345647380 is about 18591.5943372267. The cubic root of 345647380 is about 701.7963251410.

The spelling of 345647380 in words is "three hundred forty-five million, six hundred forty-seven thousand, three hundred eighty".