678345912 has 24 divisors (see below), whose sum is σ = 1837187040. Its totient is φ = 226115280.

The previous prime is 678345911. The next prime is 678345919. The reversal of 678345912 is 219543876.

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×678345912² = 920306352654223488, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678345911) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4710664 + ... + 4710807.

It is an arithmetic number, because the mean of its divisors is an integer number (76549460).

Almost surely, 2^678345912 is an apocalyptic number.

It is an amenable number.

678345912 is an abundant number, since it is smaller than the sum of its proper divisors (1158841128).

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

678345912 is a wasteful number, since it uses less digits than its factorization.

678345912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9421483 (or 9421476 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 678345912 is about 26045.0746207416. The cubic root of 678345912 is about 878.6523414786.

The spelling of 678345912 in words is "six hundred seventy-eight million, three hundred forty-five thousand, nine hundred twelve".