71782145 has 4 divisors (see below), whose sum is σ = 86138580. Its totient is φ = 57425712.

The previous prime is 71782129. The next prime is 71782147. The reversal of 71782145 is 54128717.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54128717 = 673 ⋅80429.

It can be written as a sum of positive squares in 2 ways, for example, as 31281649 + 40500496 = 5593^2 + 6364^2 .

It is a cyclic number.

It is not a de Polignac number, because 71782145 - 2⁴ = 71782129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71782147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7178210 + ... + 7178219.

It is an arithmetic number, because the mean of its divisors is an integer number (21534645).

Almost surely, 2^71782145 is an apocalyptic number.

It is an amenable number.

71782145 is a deficient number, since it is larger than the sum of its proper divisors (14356435).

71782145 is a wasteful number, since it uses less digits than its factorization.

71782145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14356434.

The product of its digits is 15680, while the sum is 35.

The square root of 71782145 is about 8472.4344199291. The cubic root of 71782145 is about 415.5967512035.

The spelling of 71782145 in words is "seventy-one million, seven hundred eighty-two thousand, one hundred forty-five".