71091738 has 12 divisors (see below), whose sum is σ = 154032138. Its totient is φ = 23697240.

The previous prime is 71091721. The next prime is 71091751. The reversal of 71091738 is 83719017.

It can be written as a sum of positive squares in only one way, i.e., 58110129 + 12981609 = 7623^2 + 3603^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1974753 + ... + 1974788.

Almost surely, 2^71091738 is an apocalyptic number.

71091738 is an abundant number, since it is smaller than the sum of its proper divisors (82940400).

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

71091738 is a wasteful number, since it uses less digits than its factorization.

71091738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3949549 (or 3949546 counting only the distinct ones).

The product of its (nonzero) digits is 10584, while the sum is 36.

The square root of 71091738 is about 8431.5916646859. The cubic root of 71091738 is about 414.2600410680.

The spelling of 71091738 in words is "seventy-one million, ninety-one thousand, seven hundred thirty-eight".