78242288338818 has 24 divisors (see below), whose sum is σ = 170762366525868. Its totient is φ = 25890392247552.

The previous prime is 78242288338759. The next prime is 78242288338883. The reversal of 78242288338818 is 81883388224287.

78242288338818 is a `hidden beast` number, since 7 + 8 + 2 + 4 + 2 + 288 + 338 + 8 + 1 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 72836956284849 + 5405332053969 = 8534457^2 + 2324937^2 .

It is a super-2 number, since 2×78242288338818² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15864208471 + ... + 15864213402.

Almost surely, 2^{78242288338818} is an apocalyptic number.

78242288338818 is an abundant number, since it is smaller than the sum of its proper divisors (92520078187050).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78242288338818 is a wasteful number, since it uses less digits than its factorization.

78242288338818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31728422018 (or 31728422015 counting only the distinct ones).

The product of its digits is 528482304, while the sum is 72.

The spelling of 78242288338818 in words is "seventy-eight trillion, two hundred forty-two billion, two hundred eighty-eight million, three hundred thirty-eight thousand, eight hundred eighteen".