71919918 has 48 divisors (see below), whose sum is σ = 178620000. Its totient is φ = 20487168.

The previous prime is 71919871. The next prime is 71919923. The reversal of 71919918 is 81991917.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 56958 + ... + 58206.

It is an arithmetic number, because the mean of its divisors is an integer number (3721250).

Almost surely, 2^71919918 is an apocalyptic number.

71919918 is an abundant number, since it is smaller than the sum of its proper divisors (106700082).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71919918 is a wasteful number, since it uses less digits than its factorization.

71919918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1721 (or 1718 counting only the distinct ones).

The product of its digits is 40824, while the sum is 45.

The square root of 71919918 is about 8480.5611842613. The cubic root of 71919918 is about 415.8624691757.

The spelling of 71919918 in words is "seventy-one million, nine hundred nineteen thousand, nine hundred eighteen".