678695920 has 80 divisors (see below), whose sum is σ = 1806902208. Its totient is φ = 232243200.

The previous prime is 678695917. The next prime is 678695957. The reversal of 678695920 is 29596876.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

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 15 ways as a sum of consecutive naturals, for example, 423120 + ... + 424720.

Almost surely, 2^678695920 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 678695920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (903451104).

678695920 is an abundant number, since it is smaller than the sum of its proper divisors (1128206288).

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

678695920 is a wasteful number, since it uses less digits than its factorization.

678695920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2378 (or 2372 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 52.

The square root of 678695920 is about 26051.7930285038. The cubic root of 678695920 is about 878.8034357140.

The spelling of 678695920 in words is "six hundred seventy-eight million, six hundred ninety-five thousand, nine hundred twenty".