678188940 has 96 divisors (see below), whose sum is σ = 2230937856. Its totient is φ = 151760640.

The previous prime is 678188921. The next prime is 678188957. The reversal of 678188940 is 49881876.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30942 + ... + 48101.

It is an arithmetic number, because the mean of its divisors is an integer number (23238936).

Almost surely, 2^678188940 is an apocalyptic number.

678188940 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

678188940 is an abundant number, since it is smaller than the sum of its proper divisors (1552748916).

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

678188940 is a wasteful number, since it uses less digits than its factorization.

678188940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79079 (or 79077 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 51.

The square root of 678188940 is about 26042.0609783481. The cubic root of 678188940 is about 878.5845616763.

The spelling of 678188940 in words is "six hundred seventy-eight million, one hundred eighty-eight thousand, nine hundred forty".