71491668 has 12 divisors (see below), whose sum is σ = 166813920. Its totient is φ = 23830552.

The previous prime is 71491663. The next prime is 71491703. The reversal of 71491668 is 86619417.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×71491668² = 10222117186844448, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71491663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2978808 + ... + 2978831.

It is an arithmetic number, because the mean of its divisors is an integer number (13901160).

Almost surely, 2^71491668 is an apocalyptic number.

It is an amenable number.

71491668 is an abundant number, since it is smaller than the sum of its proper divisors (95322252).

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

71491668 is a wasteful number, since it uses less digits than its factorization.

71491668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5957646 (or 5957644 counting only the distinct ones).

The product of its digits is 72576, while the sum is 42.

The square root of 71491668 is about 8455.2745668015. The cubic root of 71491668 is about 415.0354022153.

The spelling of 71491668 in words is "seventy-one million, four hundred ninety-one thousand, six hundred sixty-eight".