71811042990 has 32 divisors (see below), whose sum is σ = 172715587200. Its totient is φ = 19108602144.

The previous prime is 71811042959. The next prime is 71811043009. The reversal of 71811042990 is 9924011817.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2548840 + ... + 2576859.

It is an arithmetic number, because the mean of its divisors is an integer number (5397362100).

Almost surely, 2^71811042990 is an apocalyptic number.

71811042990 is an abundant number, since it is smaller than the sum of its proper divisors (100904544210).

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

71811042990 is a wasteful number, since it uses less digits than its factorization.

71811042990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5126176.

The product of its (nonzero) digits is 36288, while the sum is 42.

The spelling of 71811042990 in words is "seventy-one billion, eight hundred eleven million, forty-two thousand, nine hundred ninety".