78614618 has 4 divisors (see below), whose sum is σ = 117921930. Its totient is φ = 39307308.

The previous prime is 78614617. The next prime is 78614639. The reversal of 78614618 is 81641687.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81641687 = 1409 ⋅57943.

It can be written as a sum of positive squares in only one way, i.e., 68773849 + 9840769 = 8293^2 + 3137^2 .

It is not an unprimeable number, because it can be changed into a prime (78614611) by changing a digit.

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 as a sum of consecutive naturals, namely, 19653653 + ... + 19653656.

Almost surely, 2^78614618 is an apocalyptic number.

78614618 is a deficient number, since it is larger than the sum of its proper divisors (39307312).

78614618 is a wasteful number, since it uses less digits than its factorization.

78614618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39307311.

The product of its digits is 64512, while the sum is 41.

The square root of 78614618 is about 8866.4884819189. The cubic root of 78614618 is about 428.3851781919.

The spelling of 78614618 in words is "seventy-eight million, six hundred fourteen thousand, six hundred eighteen".