77831844 has 12 divisors (see below), whose sum is σ = 181607664. Its totient is φ = 25943944.

The previous prime is 77831813. The next prime is 77831861. The reversal of 77831844 is 44813877.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 77831796 and 77831805.

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 3 ways as a sum of consecutive naturals, for example, 3242982 + ... + 3243005.

It is an arithmetic number, because the mean of its divisors is an integer number (15133972).

Almost surely, 2^77831844 is an apocalyptic number.

It is an amenable number.

77831844 is an abundant number, since it is smaller than the sum of its proper divisors (103775820).

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

77831844 is a wasteful number, since it uses less digits than its factorization.

77831844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6485994 (or 6485992 counting only the distinct ones).

The product of its digits is 150528, while the sum is 42.

The square root of 77831844 is about 8822.2357710503. The cubic root of 77831844 is about 426.9586074354.

The spelling of 77831844 in words is "seventy-seven million, eight hundred thirty-one thousand, eight hundred forty-four".