345720280 has 32 divisors (see below), whose sum is σ = 782839440. Its totient is φ = 137404800.

The previous prime is 345720253. The next prime is 345720293. The reversal of 345720280 is 82027543.

345720280 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21246 + ... + 33805.

Almost surely, 2^345720280 is an apocalyptic number.

It is an amenable number.

345720280 is an abundant number, since it is smaller than the sum of its proper divisors (437119160).

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

345720280 is a wasteful number, since it uses less digits than its factorization.

345720280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55219 (or 55215 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 345720280 is about 18593.5547972947. The cubic root of 345720280 is about 701.8456599628.

The spelling of 345720280 in words is "three hundred forty-five million, seven hundred twenty thousand, two hundred eighty".