71809485 has 64 divisors (see below), whose sum is σ = 131604480. Its totient is φ = 33120000.

The previous prime is 71809459. The next prime is 71809501. The reversal of 71809485 is 58490817.

It is not a de Polignac number, because 71809485 - 2⁵ = 71809453 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 516546 + ... + 516684.

It is an arithmetic number, because the mean of its divisors is an integer number (2056320).

Almost surely, 2^71809485 is an apocalyptic number.

It is an amenable number.

71809485 is a deficient number, since it is larger than the sum of its proper divisors (59794995).

71809485 is a wasteful number, since it uses less digits than its factorization.

71809485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290.

The product of its (nonzero) digits is 80640, while the sum is 42.

The square root of 71809485 is about 8474.0477341115. The cubic root of 71809485 is about 415.6495079298.

The spelling of 71809485 in words is "seventy-one million, eight hundred nine thousand, four hundred eighty-five".