71995566 has 16 divisors (see below), whose sum is σ = 150251904. Its totient is φ = 22955064.

The previous prime is 71995531. The next prime is 71995591. The reversal of 71995566 is 66559917.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 260716 + ... + 260991.

It is an arithmetic number, because the mean of its divisors is an integer number (9390744).

Almost surely, 2^71995566 is an apocalyptic number.

71995566 is an abundant number, since it is smaller than the sum of its proper divisors (78256338).

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

71995566 is a wasteful number, since it uses less digits than its factorization.

71995566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521735.

The product of its digits is 510300, while the sum is 48.

The square root of 71995566 is about 8485.0200942602. The cubic root of 71995566 is about 416.0082245354.

The spelling of 71995566 in words is "seventy-one million, nine hundred ninety-five thousand, five hundred sixty-six".