67786005640 has 48 divisors (see below), whose sum is σ = 153956810700. Its totient is φ = 26858832768.

The previous prime is 67786005541. The next prime is 67786005643. The reversal of 67786005640 is 4650068776.

It can be written as a sum of positive squares in 2 ways, for example, as 67723816644 + 62188996 = 260238^2 + 7886^2 .

It is a super-2 number, since 2×67786005640² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (67786005643) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 17189509 + ... + 17193451.

Almost surely, 2^67786005640 is an apocalyptic number.

It is an amenable number.

67786005640 is an abundant number, since it is smaller than the sum of its proper divisors (86170805060).

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

67786005640 is an equidigital number, since it uses as much as digits as its factorization.

67786005640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8006 (or 4059 counting only the distinct ones).

The product of its (nonzero) digits is 1693440, while the sum is 49.

The spelling of 67786005640 in words is "sixty-seven billion, seven hundred eighty-six million, five thousand, six hundred forty".