67620764781 has 12 divisors (see below), whose sum is σ = 97704341280. Its totient is φ = 45066708360.

The previous prime is 67620764779. The next prime is 67620764789. The reversal of 67620764781 is 18746702676.

67620764781 is a `hidden beast` number, since 6 + 7 + 620 + 7 + 6 + 4 + 7 + 8 + 1 = 666.

It is not a de Polignac number, because 67620764781 - 2¹ = 67620764779 is a prime.

It is a super-2 number, since 2×67620764781² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67620764789) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 1119051 + ... + 1177928.

It is an arithmetic number, because the mean of its divisors is an integer number (8142028440).

Almost surely, 2^67620764781 is an apocalyptic number.

It is an amenable number.

67620764781 is a deficient number, since it is larger than the sum of its proper divisors (30083576499).

67620764781 is a wasteful number, since it uses less digits than its factorization.

67620764781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2300256 (or 2300253 counting only the distinct ones).

The product of its (nonzero) digits is 4741632, while the sum is 54.

The spelling of 67620764781 in words is "sixty-seven billion, six hundred twenty million, seven hundred sixty-four thousand, seven hundred eighty-one".