77984461639 has 8 divisors (see below), whose sum is σ = 89775648288. Its totient is φ = 66355912320.

The previous prime is 77984461619. The next prime is 77984461649. The reversal of 77984461639 is 93616448977.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 77984461639 - 2²⁵ = 77950907207 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77984461609) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 40658302 + ... + 40660219.

It is an arithmetic number, because the mean of its divisors is an integer number (11221956036).

Almost surely, 2^77984461639 is an apocalyptic number.

77984461639 is a deficient number, since it is larger than the sum of its proper divisors (11791186649).

77984461639 is a wasteful number, since it uses less digits than its factorization.

77984461639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81318665.

The product of its digits is 54867456, while the sum is 64.

The spelling of 77984461639 in words is "seventy-seven billion, nine hundred eighty-four million, four hundred sixty-one thousand, six hundred thirty-nine".