678390 has 16 divisors (see below), whose sum is σ = 1628208. Its totient is φ = 180896.

The previous prime is 678383. The next prime is 678401. The reversal of 678390 is 93876.

It is a happy number.

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, 11277 + ... + 11336.

It is an arithmetic number, because the mean of its divisors is an integer number (101763).

2⁶⁷⁸³⁹⁰ is an apocalyptic number.

678390 is an abundant number, since it is smaller than the sum of its proper divisors (949818).

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

678390 is a wasteful number, since it uses less digits than its factorization.

678390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22623.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 678390 is about 823.6443407199. The cubic root of 678390 is about 87.8671376598.

The spelling of 678390 in words is "six hundred seventy-eight thousand, three hundred ninety".