71785011 has 4 divisors (see below), whose sum is σ = 95713352. Its totient is φ = 47856672.

The previous prime is 71785003. The next prime is 71785039. The reversal of 71785011 is 11058717.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11058717 = 3 ⋅3686239.

It is not a de Polignac number, because 71785011 - 2³ = 71785003 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 71785011.

It is not an unprimeable number, because it can be changed into a prime (71785811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11964166 + ... + 11964171.

It is an arithmetic number, because the mean of its divisors is an integer number (23928338).

Almost surely, 2^71785011 is an apocalyptic number.

71785011 is a deficient number, since it is larger than the sum of its proper divisors (23928341).

71785011 is a wasteful number, since it uses less digits than its factorization.

71785011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23928340.

The product of its (nonzero) digits is 1960, while the sum is 30.

The square root of 71785011 is about 8472.6035549883. The cubic root of 71785011 is about 415.6022822188.

The spelling of 71785011 in words is "seventy-one million, seven hundred eighty-five thousand, eleven".