67280657138 has 18 divisors (see below), whose sum is σ = 107216659431. Its totient is φ = 31658551104.

The previous prime is 67280657131. The next prime is 67280657219. The reversal of 67280657138 is 83175608276.

It can be written as a sum of positive squares in 5 ways, for example, as 49667916769 + 17612740369 = 222863^2 + 132713^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=183413.

It is a super-2 number, since 2×67280657138² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 67280657138.

It is not an unprimeable number, because it can be changed into a prime (67280657131) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 6230648 + ... + 6241436.

Almost surely, 2^67280657138 is an apocalyptic number.

67280657138 is a deficient number, since it is larger than the sum of its proper divisors (39936002293).

67280657138 is an frugal number, since it uses more digits than its factorization.

67280657138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21614 (or 10808 counting only the distinct ones).

The product of its (nonzero) digits is 3386880, while the sum is 53.

The spelling of 67280657138 in words is "sixty-seven billion, two hundred eighty million, six hundred fifty-seven thousand, one hundred thirty-eight".