71955918 has 16 divisors (see below), whose sum is σ = 159902160. Its totient is φ = 23985288.

The previous prime is 71955913. The next prime is 71955941. The reversal of 71955918 is 81955917.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71955911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 666205 + ... + 666312.

It is an arithmetic number, because the mean of its divisors is an integer number (9993885).

Almost surely, 2^71955918 is an apocalyptic number.

71955918 is an abundant number, since it is smaller than the sum of its proper divisors (87946242).

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

71955918 is a wasteful number, since it uses less digits than its factorization.

71955918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1332528 (or 1332522 counting only the distinct ones).

The product of its digits is 113400, while the sum is 45.

The square root of 71955918 is about 8482.6834197676. The cubic root of 71955918 is about 415.9318451893.

Subtracting 71955918 from its reverse (81955917), we obtain a palindrome (9999999).

The spelling of 71955918 in words is "seventy-one million, nine hundred fifty-five thousand, nine hundred eighteen".