78865236609 has 8 divisors (see below), whose sum is σ = 105171425952. Its totient is φ = 52567935840.

The previous prime is 78865236607. The next prime is 78865236647. The reversal of 78865236609 is 90663256887.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78865236609 - 2¹ = 78865236607 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78865236607) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2201412 + ... + 2236949.

It is an arithmetic number, because the mean of its divisors is an integer number (13146428244).

Almost surely, 2^78865236609 is an apocalyptic number.

It is an amenable number.

78865236609 is a deficient number, since it is larger than the sum of its proper divisors (26306189343).

78865236609 is a wasteful number, since it uses less digits than its factorization.

78865236609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4444287.

The product of its (nonzero) digits is 26127360, while the sum is 60.

The spelling of 78865236609 in words is "seventy-eight billion, eight hundred sixty-five million, two hundred thirty-six thousand, six hundred nine".