345620 has 24 divisors (see below), whose sum is σ = 792288. Its totient is φ = 125600.

The previous prime is 345607. The next prime is 345637. The reversal of 345620 is 26543.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 345592 and 345601.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 566 + ... + 1005.

It is an arithmetic number, because the mean of its divisors is an integer number (33012).

2³⁴⁵⁶²⁰ is an apocalyptic number.

It is an amenable number.

345620 is an abundant number, since it is smaller than the sum of its proper divisors (446668).

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

345620 is a wasteful number, since it uses less digits than its factorization.

345620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1591 (or 1589 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 345620 is about 587.8945483673. The cubic root of 345620 is about 70.1777794029.

The spelling of 345620 in words is "three hundred forty-five thousand, six hundred twenty".