77777982 has 48 divisors (see below), whose sum is σ = 183980160. Its totient is φ = 24558552.

The previous prime is 77777929. The next prime is 77778011. The reversal of 77777982 is 28977777.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5023 + ... + 13445.

It is an arithmetic number, because the mean of its divisors is an integer number (3832920).

Almost surely, 2^77777982 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77777982, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91990080).

77777982 is an abundant number, since it is smaller than the sum of its proper divisors (106202178).

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

77777982 is a wasteful number, since it uses less digits than its factorization.

77777982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8459 (or 8447 counting only the distinct ones).

The product of its digits is 2420208, while the sum is 54.

The square root of 77777982 is about 8819.1826151861. The cubic root of 77777982 is about 426.8600952661.

The spelling of 77777982 in words is "seventy-seven million, seven hundred seventy-seven thousand, nine hundred eighty-two".