38091720891780 has 72 divisors (see below), whose sum is σ = 115552703454552. Its totient is φ = 10157105051136.

The previous prime is 38091720891773. The next prime is 38091720891827. The reversal of 38091720891780 is 8719802719083.

38091720891780 is a `hidden beast` number, since 380 + 9 + 1 + 7 + 2 + 0 + 89 + 178 + 0 = 666.

38091720891780 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1674068524164 + 36417652367616 = 1293858^2 + 6034704^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4487337 + ... + 9814256.

It is an arithmetic number, because the mean of its divisors is an integer number (1604898659091).

Almost surely, 2^{38091720891780} is an apocalyptic number.

38091720891780 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

38091720891780 is an abundant number, since it is smaller than the sum of its proper divisors (77460982562772).

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

38091720891780 is a wasteful number, since it uses less digits than its factorization.

38091720891780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14316405 (or 14316400 counting only the distinct ones).

The product of its (nonzero) digits is 12192768, while the sum is 63.

The spelling of 38091720891780 in words is "thirty-eight trillion, ninety-one billion, seven hundred twenty million, eight hundred ninety-one thousand, seven hundred eighty".