71785749 has 16 divisors (see below), whose sum is σ = 109831680. Its totient is φ = 40854000.

The previous prime is 71785741. The next prime is 71785751. The reversal of 71785749 is 94758717.

It is not a de Polignac number, because 71785749 - 2³ = 71785741 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 71785698 and 71785707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71785741) 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 15 ways as a sum of consecutive naturals, for example, 1539 + ... + 12080.

It is an arithmetic number, because the mean of its divisors is an integer number (6864480).

Almost surely, 2^71785749 is an apocalyptic number.

It is an amenable number.

71785749 is a deficient number, since it is larger than the sum of its proper divisors (38045931).

71785749 is a wasteful number, since it uses less digits than its factorization.

71785749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13880.

The product of its digits is 493920, while the sum is 48.

The square root of 71785749 is about 8472.6471070144. The cubic root of 71785749 is about 415.6037064411.

The spelling of 71785749 in words is "seventy-one million, seven hundred eighty-five thousand, seven hundred forty-nine".