78804279841 has 45 divisors (see below), whose sum is σ = 97949426649. Its totient is φ = 63384556032.

The previous prime is 78804279821. The next prime is 78804279871. The reversal of 78804279841 is 14897240887.

The square root of 78804279841 is 280721.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 247401441 + 78556878400 = 15729^2 + 280280^2 .

It is not a de Polignac number, because 78804279841 - 2²¹ = 78802182689 is a prime.

It is a super-2 number, since 2×78804279841² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78804279821) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 233840425 + ... + 233840761.

Almost surely, 2^78804279841 is an apocalyptic number.

78804279841 is the 280721-st square number.

78804279841 is the 140361-st centered octagonal number.

It is an amenable number.

78804279841 is a deficient number, since it is larger than the sum of its proper divisors (19145146808).

78804279841 is an frugal number, since it uses more digits than its factorization.

78804279841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 736 (or 361 counting only the distinct ones).

The product of its (nonzero) digits is 7225344, while the sum is 58.

The spelling of 78804279841 in words is "seventy-eight billion, eight hundred four million, two hundred seventy-nine thousand, eight hundred forty-one".