71304409 has 16 divisors (see below), whose sum is σ = 83232576. Its totient is φ = 60364800.

The previous prime is 71304403. The next prime is 71304427. The reversal of 71304409 is 90440317.

It is a cyclic number.

It is not a de Polignac number, because 71304409 - 2¹³ = 71296217 is a prime.

It is a super-3 number, since 3×71304409³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71304403) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16174 + ... + 20104.

It is an arithmetic number, because the mean of its divisors is an integer number (5202036).

Almost surely, 2^71304409 is an apocalyptic number.

It is an amenable number.

71304409 is a deficient number, since it is larger than the sum of its proper divisors (11928167).

71304409 is a wasteful number, since it uses less digits than its factorization.

71304409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4056.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 71304409 is about 8444.1938040289. The cubic root of 71304409 is about 414.6727162671.

The spelling of 71304409 in words is "seventy-one million, three hundred four thousand, four hundred nine".