78871803572978 has 96 divisors (see below), whose sum is σ = 138407954568336. Its totient is φ = 33564879888384.

The previous prime is 78871803572879. The next prime is 78871803573041. The reversal of 78871803572978 is 87927530817887.

It can be written as a sum of positive squares in 24 ways, for example, as 41146905409 + 78830656667569 = 202847^2 + 8878663^2 .

It is a super-2 number, since 2×78871803572978² (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 47 ways as a sum of consecutive naturals, for example, 205980950 + ... + 206363502.

Almost surely, 2^{78871803572978} is an apocalyptic number.

78871803572978 is a deficient number, since it is larger than the sum of its proper divisors (59536150995358).

78871803572978 is a wasteful number, since it uses less digits than its factorization.

78871803572978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383328 (or 383315 counting only the distinct ones).

The product of its (nonzero) digits is 2655313920, while the sum is 80.

The spelling of 78871803572978 in words is "seventy-eight trillion, eight hundred seventy-one billion, eight hundred three million, five hundred seventy-two thousand, nine hundred seventy-eight".