78612643 has 16 divisors (see below), whose sum is σ = 84877056. Its totient is φ = 72626400.

The previous prime is 78612637. The next prime is 78612647. The reversal of 78612643 is 34621687.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78612643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78612647) 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 in 15 ways as a sum of consecutive naturals, for example, 99496 + ... + 100282.

It is an arithmetic number, because the mean of its divisors is an integer number (5304816).

Almost surely, 2^78612643 is an apocalyptic number.

78612643 is a deficient number, since it is larger than the sum of its proper divisors (6264413).

78612643 is a wasteful number, since it uses less digits than its factorization.

78612643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 954.

The product of its digits is 48384, while the sum is 37.

The square root of 78612643 is about 8866.3771068007. The cubic root of 78612643 is about 428.3815907853.

The spelling of 78612643 in words is "seventy-eight million, six hundred twelve thousand, six hundred forty-three".