78814624459 has 4 divisors (see below), whose sum is σ = 81532370160. Its totient is φ = 76096878760.

The previous prime is 78814624457. The next prime is 78814624463. The reversal of 78814624459 is 95442641887.

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 78814624459 - 2¹ = 78814624457 is a prime.

It is a super-2 number, since 2×78814624459² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (78814624457) 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, 1358872807 + ... + 1358872864.

It is an arithmetic number, because the mean of its divisors is an integer number (20383092540).

Almost surely, 2^78814624459 is an apocalyptic number.

78814624459 is a deficient number, since it is larger than the sum of its proper divisors (2717745701).

78814624459 is a wasteful number, since it uses less digits than its factorization.

78814624459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2717745700.

The product of its digits is 15482880, while the sum is 58.

The spelling of 78814624459 in words is "seventy-eight billion, eight hundred fourteen million, six hundred twenty-four thousand, four hundred fifty-nine".