77881444894 has 32 divisors (see below), whose sum is σ = 137273149440. Its totient is φ = 32769184800.

The previous prime is 77881444859. The next prime is 77881444903. The reversal of 77881444894 is 49844418877.

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 15 ways as a sum of consecutive naturals, for example, 2466829 + ... + 2498200.

It is an arithmetic number, because the mean of its divisors is an integer number (4289785920).

Almost surely, 2^77881444894 is an apocalyptic number.

77881444894 is a deficient number, since it is larger than the sum of its proper divisors (59391704546).

77881444894 is a wasteful number, since it uses less digits than its factorization.

77881444894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4965096.

The product of its digits is 57802752, while the sum is 64.

The spelling of 77881444894 in words is "seventy-seven billion, eight hundred eighty-one million, four hundred forty-four thousand, eight hundred ninety-four".