78611144 has 8 divisors (see below), whose sum is σ = 147395910. Its totient is φ = 39305568.

The previous prime is 78611107. The next prime is 78611149. The reversal of 78611144 is 44111687.

It can be written as a sum of positive squares in only one way, i.e., 55204900 + 23406244 = 7430^2 + 4838^2 .

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 78611144.

It is not an unprimeable number, because it can be changed into a prime (78611149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4913189 + ... + 4913204.

Almost surely, 2^78611144 is an apocalyptic number.

It is an amenable number.

78611144 is a deficient number, since it is larger than the sum of its proper divisors (68784766).

78611144 is a wasteful number, since it uses less digits than its factorization.

78611144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9826399 (or 9826395 counting only the distinct ones).

The product of its digits is 5376, while the sum is 32.

The square root of 78611144 is about 8866.2925735620. The cubic root of 78611144 is about 428.3788679489.

The spelling of 78611144 in words is "seventy-eight million, six hundred eleven thousand, one hundred forty-four".