678363520 has 64 divisors (see below), whose sum is σ = 1642363200. Its totient is φ = 267890688.

The previous prime is 678363503. The next prime is 678363551. The reversal of 678363520 is 25363876.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (40).

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, 43852 + ... + 57268.

It is an arithmetic number, because the mean of its divisors is an integer number (25661925).

Almost surely, 2^678363520 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 678363520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (821181600).

678363520 is an abundant number, since it is smaller than the sum of its proper divisors (963999680).

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

678363520 is a wasteful number, since it uses less digits than its factorization.

678363520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13515 (or 13503 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 40.

The square root of 678363520 is about 26045.4126479117. The cubic root of 678363520 is about 878.6599438814.

The spelling of 678363520 in words is "six hundred seventy-eight million, three hundred sixty-three thousand, five hundred twenty".