71621966 has 16 divisors (see below), whose sum is σ = 119430528. Its totient is φ = 31989600.

The previous prime is 71621941. The next prime is 71621983. The reversal of 71621966 is 66912617.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43625 + ... + 45236.

It is an arithmetic number, because the mean of its divisors is an integer number (7464408).

Almost surely, 2^71621966 is an apocalyptic number.

71621966 is a deficient number, since it is larger than the sum of its proper divisors (47808562).

71621966 is a wasteful number, since it uses less digits than its factorization.

71621966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88907.

The product of its digits is 27216, while the sum is 38.

The square root of 71621966 is about 8462.9761904427. The cubic root of 71621966 is about 415.2873917776.

The spelling of 71621966 in words is "seventy-one million, six hundred twenty-one thousand, nine hundred sixty-six".