77427808986 has 64 divisors (see below), whose sum is σ = 173360259072. Its totient is φ = 22850160000.

The previous prime is 77427808961. The next prime is 77427809057. The reversal of 77427808986 is 68980872477.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 1520071 + ... + 1570181.

It is an arithmetic number, because the mean of its divisors is an integer number (2708754048).

Almost surely, 2^77427808986 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77427808986, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86680129536).

77427808986 is an abundant number, since it is smaller than the sum of its proper divisors (95932450086).

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

77427808986 is a wasteful number, since it uses less digits than its factorization.

77427808986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50739.

The product of its (nonzero) digits is 75866112, while the sum is 66.

The spelling of 77427808986 in words is "seventy-seven billion, four hundred twenty-seven million, eight hundred eight thousand, nine hundred eighty-six".