71409769 has 4 divisors (see below), whose sum is σ = 71667844. Its totient is φ = 71151696.

The previous prime is 71409719. The next prime is 71409781. The reversal of 71409769 is 96790417.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7617600 + 63792169 = 2760^2 + 7987^2 .

It is a cyclic number.

It is not a de Polignac number, because 71409769 - 2¹⁵ = 71377001 is a prime.

It is a super-2 number, since 2×71409769² = 10198710217266722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71409719) 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, 128622 + ... + 129175.

It is an arithmetic number, because the mean of its divisors is an integer number (17916961).

Almost surely, 2^71409769 is an apocalyptic number.

It is an amenable number.

71409769 is a deficient number, since it is larger than the sum of its proper divisors (258075).

71409769 is a wasteful number, since it uses less digits than its factorization.

71409769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258074.

The product of its (nonzero) digits is 95256, while the sum is 43.

The square root of 71409769 is about 8450.4301073969. The cubic root of 71409769 is about 414.8768570619.

The spelling of 71409769 in words is "seventy-one million, four hundred nine thousand, seven hundred sixty-nine".