78647144 has 8 divisors (see below), whose sum is σ = 147463410. Its totient is φ = 39323568.

The previous prime is 78647141. The next prime is 78647161. The reversal of 78647144 is 44174687.

It can be written as a sum of positive squares in only one way, i.e., 51294244 + 27352900 = 7162^2 + 5230^2 .

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

It is not an unprimeable number, because it can be changed into a prime (78647141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4915439 + ... + 4915454.

Almost surely, 2^78647144 is an apocalyptic number.

It is an amenable number.

78647144 is a deficient number, since it is larger than the sum of its proper divisors (68816266).

78647144 is a wasteful number, since it uses less digits than its factorization.

78647144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9830899 (or 9830895 counting only the distinct ones).

The product of its digits is 150528, while the sum is 41.

The square root of 78647144 is about 8868.3225020293. The cubic root of 78647144 is about 428.4442500519. Note that the first 3 decimals are identical.

The spelling of 78647144 in words is "seventy-eight million, six hundred forty-seven thousand, one hundred forty-four".