345020280 has 64 divisors (see below), whose sum is σ = 1129161600. Its totient is φ = 83640960.

The previous prime is 345020257. The next prime is 345020281. The reversal of 345020280 is 82020543.

It is a super-2 number, since 2×345020280² = 238077987222556800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 345020280.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (345020281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 129370 + ... + 132009.

It is an arithmetic number, because the mean of its divisors is an integer number (17643150).

Almost surely, 2^345020280 is an apocalyptic number.

345020280 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

345020280 is an abundant number, since it is smaller than the sum of its proper divisors (784141320).

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

345020280 is a wasteful number, since it uses less digits than its factorization.

345020280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261404 (or 261400 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 345020280 is about 18574.7215322330. The cubic root of 345020280 is about 701.3716506299.

The spelling of 345020280 in words is "three hundred forty-five million, twenty thousand, two hundred eighty".