678787820 has 12 divisors (see below), whose sum is σ = 1425454464. Its totient is φ = 271515120.

The previous prime is 678787807. The next prime is 678787853. The reversal of 678787820 is 28787876.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16969676 + ... + 16969715.

It is an arithmetic number, because the mean of its divisors is an integer number (118787872).

Almost surely, 2^678787820 is an apocalyptic number.

It is an amenable number.

678787820 is an abundant number, since it is smaller than the sum of its proper divisors (746666644).

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

678787820 is a wasteful number, since it uses less digits than its factorization.

678787820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33939400 (or 33939398 counting only the distinct ones).

The product of its (nonzero) digits is 2107392, while the sum is 53.

The square root of 678787820 is about 26053.5567629451. The cubic root of 678787820 is about 878.8430992257.

The spelling of 678787820 in words is "six hundred seventy-eight million, seven hundred eighty-seven thousand, eight hundred twenty".