71221716 has 36 divisors (see below), whose sum is σ = 182063700. Its totient is φ = 23472768.

The previous prime is 71221697. The next prime is 71221723. The reversal of 71221716 is 61712217.

It can be written as a sum of positive squares in 2 ways, for example, as 16402500 + 54819216 = 4050^2 + 7404^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a self number, because there is not a number n which added to its sum of digits gives 71221716.

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 11 ways as a sum of consecutive naturals, for example, 7911 + ... + 14318.

It is an arithmetic number, because the mean of its divisors is an integer number (5057325).

Almost surely, 2^71221716 is an apocalyptic number.

It is an amenable number.

71221716 is an abundant number, since it is smaller than the sum of its proper divisors (110841984).

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

71221716 is a wasteful number, since it uses less digits than its factorization.

71221716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22328 (or 22323 counting only the distinct ones).

The product of its digits is 1176, while the sum is 27.

The square root of 71221716 is about 8439.2959421980. The cubic root of 71221716 is about 414.5123531342.

The spelling of 71221716 in words is "seventy-one million, two hundred twenty-one thousand, seven hundred sixteen".