345678 has 16 divisors (see below), whose sum is σ = 732240. Its totient is φ = 108416.

The previous prime is 345673. The next prime is 345679. The reversal of 345678 is 876543.

345678 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is an alternating number because its digits alternate between odd and even.

It is a straight-line number, since its digits are in arithmetic progression.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (345673) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1593 + ... + 1796.

It is an arithmetic number, because the mean of its divisors is an integer number (45765).

2³⁴⁵⁶⁷⁸ is an apocalyptic number.

345678 is an abundant number, since it is smaller than the sum of its proper divisors (386562).

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

345678 is a wasteful number, since it uses less digits than its factorization.

345678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3411.

The product of its digits is 20160, while the sum is 33.

The square root of 345678 is about 587.9438748724. The cubic root of 345678 is about 70.1817047964.

Adding to 345678 its reverse (876543), we get a palindrome (1222221).

The spelling of 345678 in words is "three hundred forty-five thousand, six hundred seventy-eight".