77281866380 has 24 divisors (see below), whose sum is σ = 171838503648. Its totient is φ = 29094349568.

The previous prime is 77281866379. The next prime is 77281866421. The reversal of 77281866380 is 8366818277.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 113649464 + ... + 113650143.

It is an arithmetic number, because the mean of its divisors is an integer number (7159937652).

Almost surely, 2^77281866380 is an apocalyptic number.

It is an amenable number.

77281866380 is an abundant number, since it is smaller than the sum of its proper divisors (94556637268).

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

77281866380 is a wasteful number, since it uses less digits than its factorization.

77281866380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227299633 (or 227299631 counting only the distinct ones).

The product of its (nonzero) digits is 5419008, while the sum is 56.

The spelling of 77281866380 in words is "seventy-seven billion, two hundred eighty-one million, eight hundred sixty-six thousand, three hundred eighty".