77220844444 has 12 divisors (see below), whose sum is σ = 135183145104. Its totient is φ = 38597088704.

The previous prime is 77220844427. The next prime is 77220844457. The reversal of 77220844444 is 44444802277.

It is a junction number, because it is equal to n+sod(n) for n = 77220844394 and 77220844403.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3320344 + ... + 3343519.

It is an arithmetic number, because the mean of its divisors is an integer number (11265262092).

Almost surely, 2^77220844444 is an apocalyptic number.

It is an amenable number.

77220844444 is a deficient number, since it is larger than the sum of its proper divisors (57962300660).

77220844444 is a wasteful number, since it uses less digits than its factorization.

77220844444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6666764 (or 6666762 counting only the distinct ones).

The product of its (nonzero) digits is 1605632, while the sum is 46.

The spelling of 77220844444 in words is "seventy-seven billion, two hundred twenty million, eight hundred forty-four thousand, four hundred forty-four".