77881251272 has 64 divisors (see below), whose sum is σ = 164285107200. Its totient is φ = 34310248000.

The previous prime is 77881251247. The next prime is 77881251311. The reversal of 77881251272 is 27215218877.

It is a self number, because there is not a number n which added to its sum of digits gives 77881251272.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 262997 + ... + 474267.

It is an arithmetic number, because the mean of its divisors is an integer number (2566954800).

Almost surely, 2^77881251272 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77881251272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82142553600).

77881251272 is an abundant number, since it is smaller than the sum of its proper divisors (86403855928).

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

77881251272 is a wasteful number, since it uses less digits than its factorization.

77881251272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211418 (or 211414 counting only the distinct ones).

The product of its digits is 878080, while the sum is 50.

The spelling of 77881251272 in words is "seventy-seven billion, eight hundred eighty-one million, two hundred fifty-one thousand, two hundred seventy-two".