30686818947840 has 360 divisors, whose sum is σ = 119785149803088. Its totient is φ = 7439228559360.

The previous prime is 30686818947817. The next prime is 30686818947857. The reversal of 30686818947840 is 4874981868603.

30686818947840 is a `hidden beast` number, since 30 + 6 + 8 + 6 + 8 + 1 + 89 + 478 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (360).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 12312987 + ... + 14593946.

Almost surely, 2^{30686818947840} is an apocalyptic number.

30686818947840 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

30686818947840 is an abundant number, since it is smaller than the sum of its proper divisors (89098330855248).

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

30686818947840 is a wasteful number, since it uses less digits than its factorization.

30686818947840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26906977 (or 26906954 counting only the distinct ones).

The product of its (nonzero) digits is 445906944, while the sum is 72.

The spelling of 30686818947840 in words is "thirty trillion, six hundred eighty-six billion, eight hundred eighteen million, nine hundred forty-seven thousand, eight hundred forty".