78286197544 has 16 divisors (see below), whose sum is σ = 146854830420. Its totient is φ = 39124909440.

The previous prime is 78286197499. The next prime is 78286197569. The reversal of 78286197544 is 44579168287.

It can be written as a sum of positive squares in 2 ways, for example, as 77583417444 + 702780100 = 278538^2 + 26510^2 .

It is a super-2 number, since 2×78286197544² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2255367 + ... + 2289814.

Almost surely, 2^78286197544 is an apocalyptic number.

It is an amenable number.

78286197544 is a deficient number, since it is larger than the sum of its proper divisors (68568632876).

78286197544 is a wasteful number, since it uses less digits than its factorization.

78286197544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4547340 (or 4547336 counting only the distinct ones).

The product of its digits is 27095040, while the sum is 61.

The spelling of 78286197544 in words is "seventy-eight billion, two hundred eighty-six million, one hundred ninety-seven thousand, five hundred forty-four".