30781171849896 has 256 divisors, whose sum is σ = 95131566028800. Its totient is φ = 9157818009600.

The previous prime is 30781171849891. The next prime is 30781171849969. The reversal of 30781171849896 is 69894817118703.

30781171849896 is a `hidden beast` number, since 3 + 0 + 7 + 8 + 117 + 18 + 498 + 9 + 6 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (30781171849891) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 102653980 + ... + 102953396.

It is an arithmetic number, because the mean of its divisors is an integer number (371607679800).

Almost surely, 2^{30781171849896} is an apocalyptic number.

30781171849896 is a gapful number since it is divisible by the number (36) 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 30781171849896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47565783014400).

30781171849896 is an abundant number, since it is smaller than the sum of its proper divisors (64350394178904).

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

30781171849896 is a wasteful number, since it uses less digits than its factorization.

30781171849896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300657 (or 300647 counting only the distinct ones).

The product of its (nonzero) digits is 146313216, while the sum is 72.

The spelling of 30781171849896 in words is "thirty trillion, seven hundred eighty-one billion, one hundred seventy-one million, eight hundred forty-nine thousand, eight hundred ninety-six".