678906668532 has 48 divisors (see below), whose sum is σ = 1593135287744. Its totient is φ = 225014112000.

The previous prime is 678906668513. The next prime is 678906668563. The reversal of 678906668532 is 235866609876.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14835807 + ... + 14881497.

Almost surely, 2^678906668532 is an apocalyptic number.

It is an amenable number.

678906668532 is an abundant number, since it is smaller than the sum of its proper divisors (914228619212).

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

678906668532 is a wasteful number, since it uses less digits than its factorization.

678906668532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52720 (or 52718 counting only the distinct ones).

The product of its (nonzero) digits is 156764160, while the sum is 66.

The spelling of 678906668532 in words is "six hundred seventy-eight billion, nine hundred six million, six hundred sixty-eight thousand, five hundred thirty-two".