71347940 has 12 divisors (see below), whose sum is σ = 149830716. Its totient is φ = 28539168.

The previous prime is 71347931. The next prime is 71347943. The reversal of 71347940 is 4974317.

It can be written as a sum of positive squares in 2 ways, for example, as 20994724 + 50353216 = 4582^2 + 7096^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 71347940.

It is not an unprimeable number, because it can be changed into a prime (71347943) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1783679 + ... + 1783718.

It is an arithmetic number, because the mean of its divisors is an integer number (12485893).

Almost surely, 2^71347940 is an apocalyptic number.

It is an amenable number.

71347940 is an abundant number, since it is smaller than the sum of its proper divisors (78482776).

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

71347940 is a wasteful number, since it uses less digits than its factorization.

71347940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3567406 (or 3567404 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 35.

The square root of 71347940 is about 8446.7709806766. The cubic root of 71347940 is about 414.7570843361.

The spelling of 71347940 in words is "seventy-one million, three hundred forty-seven thousand, nine hundred forty".