678020 has 48 divisors (see below), whose sum is σ = 1693440. Its totient is φ = 223104.

The previous prime is 677983. The next prime is 678023. The reversal of 678020 is 20876.

Added to its reverse (20876) it gives a square (698896 = 836²).

It is a super-2 number, since 2×678020² = 919422240800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678023) by changing a digit.

678020 is an untouchable number, because it is not equal to the sum of proper divisors of any 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 15 ways as a sum of consecutive naturals, for example, 3977 + ... + 4143.

It is an arithmetic number, because the mean of its divisors is an integer number (35280).

2⁶⁷⁸⁰²⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 678020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (846720).

678020 is an abundant number, since it is smaller than the sum of its proper divisors (1015420).

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

678020 is a wasteful number, since it uses less digits than its factorization.

678020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212 (or 210 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 678020 is about 823.4196985742. The cubic root of 678020 is about 87.8511602459.

Adding to 678020 its reverse (20876), we get a palindrome (698896).

The spelling of 678020 in words is "six hundred seventy-eight thousand, twenty".