678495191040 has 408 divisors, whose sum is σ = 2439499743408. Its totient is φ = 180910817280.

The previous prime is 678495191039. The next prime is 678495191081. The reversal of 678495191040 is 40191594876.

678495191040 is a `hidden beast` number, since 6 + 7 + 84 + 9 + 519 + 1 + 0 + 40 = 666.

It is a super-3 number, since 3×678495191040³ (a number of 36 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 79621980 + ... + 79630500.

Almost surely, 2^678495191040 is an apocalyptic number.

678495191040 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 678495191040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1219749871704).

678495191040 is an abundant number, since it is smaller than the sum of its proper divisors (1761004552368).

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

678495191040 is an frugal number, since it uses more digits than its factorization.

678495191040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8573 (or 8531 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 54.

The spelling of 678495191040 in words is "six hundred seventy-eight billion, four hundred ninety-five million, one hundred ninety-one thousand, forty".