77784632394 has 64 divisors (see below), whose sum is σ = 182991384576. Its totient is φ = 21577022784.

The previous prime is 77784632383. The next prime is 77784632461. The reversal of 77784632394 is 49323648777.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 672127 + ... + 779309.

It is an arithmetic number, because the mean of its divisors is an integer number (2859240384).

Almost surely, 2^77784632394 is an apocalyptic number.

77784632394 is a gapful number since it is divisible by the number (74) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 77784632394, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91495692288).

77784632394 is an abundant number, since it is smaller than the sum of its proper divisors (105206752182).

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

77784632394 is a wasteful number, since it uses less digits than its factorization.

77784632394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107699.

The product of its digits is 42674688, while the sum is 60.

The spelling of 77784632394 in words is "seventy-seven billion, seven hundred eighty-four million, six hundred thirty-two thousand, three hundred ninety-four".