78660643 has 4 divisors (see below), whose sum is σ = 78741648. Its totient is φ = 78579640.

The previous prime is 78660641. The next prime is 78660689. The reversal of 78660643 is 34606687.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78660643 - 2¹ = 78660641 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78660596 and 78660605.

It is not an unprimeable number, because it can be changed into a prime (78660641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39028 + ... + 40993.

It is an arithmetic number, because the mean of its divisors is an integer number (19685412).

Almost surely, 2^78660643 is an apocalyptic number.

78660643 is a deficient number, since it is larger than the sum of its proper divisors (81005).

78660643 is an equidigital number, since it uses as much as digits as its factorization.

78660643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81004.

The product of its (nonzero) digits is 145152, while the sum is 40.

The square root of 78660643 is about 8869.0835490483. The cubic root of 78660643 is about 428.4687613809.

The spelling of 78660643 in words is "seventy-eight million, six hundred sixty thousand, six hundred forty-three".