71978454842 has 48 divisors (see below), whose sum is σ = 128384611200. Its totient is φ = 30163960512.

The previous prime is 71978454841. The next prime is 71978454857. The reversal of 71978454842 is 24845487917.

It is a super-2 number, since 2×71978454842² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (71978454841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5488409 + ... + 5501507.

It is an arithmetic number, because the mean of its divisors is an integer number (2674679400).

Almost surely, 2^71978454842 is an apocalyptic number.

71978454842 is a deficient number, since it is larger than the sum of its proper divisors (56406156358).

71978454842 is a wasteful number, since it uses less digits than its factorization.

71978454842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14355 (or 14348 counting only the distinct ones).

The product of its digits is 18063360, while the sum is 59.

The spelling of 71978454842 in words is "seventy-one billion, nine hundred seventy-eight million, four hundred fifty-four thousand, eight hundred forty-two".