678989432 has 32 divisors (see below), whose sum is σ = 1390072320. Its totient is φ = 308358240.

The previous prime is 678989429. The next prime is 678989471. The reversal of 678989432 is 234989876.

It is a happy number.

It is a super-2 number, since 2×678989432² = 922053297535365248, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

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, 122873 + ... + 128279.

It is an arithmetic number, because the mean of its divisors is an integer number (43439760).

Almost surely, 2^678989432 is an apocalyptic number.

It is an amenable number.

678989432 is an abundant number, since it is smaller than the sum of its proper divisors (711082888).

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

678989432 is a wasteful number, since it uses less digits than its factorization.

678989432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6851 (or 6847 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 56.

The square root of 678989432 is about 26057.4256594929. The cubic root of 678989432 is about 878.9301012658.

The spelling of 678989432 in words is "six hundred seventy-eight million, nine hundred eighty-nine thousand, four hundred thirty-two".