678435872 has 12 divisors (see below), whose sum is σ = 1335670686. Its totient is φ = 339217920.

The previous prime is 678435871. The next prime is 678435893. The reversal of 678435872 is 278534876.

It can be written as a sum of positive squares in only one way, i.e., 667912336 + 10523536 = 25844^2 + 3244^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 678435872.

It is not an unprimeable number, because it can be changed into a prime (678435871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600529 + ... + 10600592.

Almost surely, 2^678435872 is an apocalyptic number.

It is an amenable number.

678435872 is a deficient number, since it is larger than the sum of its proper divisors (657234814).

678435872 is a wasteful number, since it uses less digits than its factorization.

678435872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21201131 (or 21201123 counting only the distinct ones).

The product of its digits is 2257920, while the sum is 50.

The square root of 678435872 is about 26046.8015694826. The cubic root of 678435872 is about 878.6911810880.

The spelling of 678435872 in words is "six hundred seventy-eight million, four hundred thirty-five thousand, eight hundred seventy-two".