85777144 has 8 divisors (see below), whose sum is σ = 160832160. Its totient is φ = 42888568.

The previous prime is 85777123. The next prime is 85777147. The reversal of 85777144 is 44177758.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 85777144.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85777147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5361064 + ... + 5361079.

It is an arithmetic number, because the mean of its divisors is an integer number (20104020).

Almost surely, 2^85777144 is an apocalyptic number.

It is an amenable number.

85777144 is a deficient number, since it is larger than the sum of its proper divisors (75055016).

85777144 is a wasteful number, since it uses less digits than its factorization.

85777144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10722149 (or 10722145 counting only the distinct ones).

The product of its digits is 219520, while the sum is 43.

The square root of 85777144 is about 9261.5951109946. The cubic root of 85777144 is about 441.0188922102.

The spelling of 85777144 in words is "eighty-five million, seven hundred seventy-seven thousand, one hundred forty-four".