71407809 has 12 divisors (see below), whose sum is σ = 112521552. Its totient is φ = 43277400.

The previous prime is 71407799. The next prime is 71407813. The reversal of 71407809 is 90870417.

It is not a de Polignac number, because 71407809 - 2¹⁶ = 71342273 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (71407829) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 360547 + ... + 360744.

It is an arithmetic number, because the mean of its divisors is an integer number (9376796).

Almost surely, 2^71407809 is an apocalyptic number.

It is an amenable number.

71407809 is a deficient number, since it is larger than the sum of its proper divisors (41113743).

71407809 is a wasteful number, since it uses less digits than its factorization.

71407809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 721308 (or 721305 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The square root of 71407809 is about 8450.3141361727. The cubic root of 71407809 is about 414.8730612877.

The spelling of 71407809 in words is "seventy-one million, four hundred seven thousand, eight hundred nine".