77828257886138 has 4 divisors (see below), whose sum is σ = 116742386829210. Its totient is φ = 38914128943068.

The previous prime is 77828257886117. The next prime is 77828257886167. The reversal of 77828257886138 is 83168875282877.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 77612875573489 + 215382312649 = 8809817^2 + 464093^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19457064471533 + ... + 19457064471536.

Almost surely, 2^{77828257886138} is an apocalyptic number.

77828257886138 is a deficient number, since it is larger than the sum of its proper divisors (38914128943072).

77828257886138 is a wasteful number, since it uses less digits than its factorization.

77828257886138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38914128943071.

The product of its digits is 4046192640, while the sum is 80.

The spelling of 77828257886138 in words is "seventy-seven trillion, eight hundred twenty-eight billion, two hundred fifty-seven million, eight hundred eighty-six thousand, one hundred thirty-eight".