71382709 has 4 divisors (see below), whose sum is σ = 73042816. Its totient is φ = 69722604.

The previous prime is 71382691. The next prime is 71382713. The reversal of 71382709 is 90728317.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90728317 = 1327 ⋅68371.

It is a cyclic number.

It is not a de Polignac number, because 71382709 - 2⁹ = 71382197 is a prime.

It is a super-2 number, since 2×71382709² = 10190982288357362, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71382769) 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, 829989 + ... + 830074.

It is an arithmetic number, because the mean of its divisors is an integer number (18260704).

Almost surely, 2^71382709 is an apocalyptic number.

It is an amenable number.

71382709 is a deficient number, since it is larger than the sum of its proper divisors (1660107).

71382709 is a wasteful number, since it uses less digits than its factorization.

71382709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1660106.

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 71382709 is about 8448.8288537525. The cubic root of 71382709 is about 414.8244459970.

The spelling of 71382709 in words is "seventy-one million, three hundred eighty-two thousand, seven hundred nine".