678873920 has 56 divisors (see below), whose sum is σ = 1711674504. Its totient is φ = 255574016.

The previous prime is 678873919. The next prime is 678873931. The reversal of 678873920 is 29378876.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 79995136 + 598878784 = 8944^2 + 24472^2 .

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 56957 + ... + 67836.

Almost surely, 2^678873920 is an apocalyptic number.

It is an amenable number.

678873920 is an abundant number, since it is smaller than the sum of its proper divisors (1032800584).

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

678873920 is a wasteful number, since it uses less digits than its factorization.

678873920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124827 (or 124817 counting only the distinct ones).

The product of its (nonzero) digits is 1016064, while the sum is 50.

The square root of 678873920 is about 26055.2090761137. The cubic root of 678873920 is about 878.8802562427.

It can be divided in two parts, 6788 and 73920, that added together give a palindrome (80708).

The spelling of 678873920 in words is "six hundred seventy-eight million, eight hundred seventy-three thousand, nine hundred twenty".