78538853556428 has 24 divisors (see below), whose sum is σ = 142186909544400. Its totient is φ = 37914108015168.

The previous prime is 78538853556413. The next prime is 78538853556433. The reversal of 78538853556428 is 82465535883587.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7035083 + ... + 14372546.

It is an arithmetic number, because the mean of its divisors is an integer number (5924454564350).

Almost surely, 2^{78538853556428} is an apocalyptic number.

It is an amenable number.

78538853556428 is a deficient number, since it is larger than the sum of its proper divisors (63648055987972).

78538853556428 is a wasteful number, since it uses less digits than its factorization.

78538853556428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21439289 (or 21439287 counting only the distinct ones).

The product of its digits is 7741440000, while the sum is 77.

The spelling of 78538853556428 in words is "seventy-eight trillion, five hundred thirty-eight billion, eight hundred fifty-three million, five hundred fifty-six thousand, four hundred twenty-eight".