71899975078 has 4 divisors (see below), whose sum is σ = 107849962620. Its totient is φ = 35949987538.

The previous prime is 71899975067. The next prime is 71899975139. The reversal of 71899975078 is 87057999817.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87057999817 = 257 ⋅338747081.

It is a super-2 number, since 2×71899975078² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 71899974998 and 71899975016.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17974993768 + ... + 17974993771.

It is an arithmetic number, because the mean of its divisors is an integer number (26962490655).

Almost surely, 2^71899975078 is an apocalyptic number.

71899975078 is a deficient number, since it is larger than the sum of its proper divisors (35949987542).

71899975078 is a wasteful number, since it uses less digits than its factorization.

71899975078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35949987541.

The product of its (nonzero) digits is 80015040, while the sum is 70.

The spelling of 71899975078 in words is "seventy-one billion, eight hundred ninety-nine million, nine hundred seventy-five thousand, seventy-eight".