78638197486 has 16 divisors (see below), whose sum is σ = 122117269824. Its totient is φ = 37955361024.

The previous prime is 78638197483. The next prime is 78638197487. The reversal of 78638197486 is 68479183687.

It is a happy number.

It is a super-2 number, since 2×78638197486² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78638197483) 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, 5723115 + ... + 5736838.

It is an arithmetic number, because the mean of its divisors is an integer number (7632329364).

Almost surely, 2^78638197486 is an apocalyptic number.

78638197486 is a deficient number, since it is larger than the sum of its proper divisors (43479072338).

78638197486 is a wasteful number, since it uses less digits than its factorization.

78638197486 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11460075.

The product of its digits is 97542144, while the sum is 67.

The spelling of 78638197486 in words is "seventy-eight billion, six hundred thirty-eight million, one hundred ninety-seven thousand, four hundred eighty-six".