71775145 has 36 divisors (see below), whose sum is σ = 97548516. Its totient is φ = 50668800.

The previous prime is 71775131. The next prime is 71775149. The reversal of 71775145 is 54157717.

It can be written as a sum of positive squares in 18 ways, for example, as 46090521 + 25684624 = 6789^2 + 5068^2 .

It is not a de Polignac number, because 71775145 - 2⁵ = 71775113 is a prime.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71775149) 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 35 ways as a sum of consecutive naturals, for example, 710595 + ... + 710695.

It is an arithmetic number, because the mean of its divisors is an integer number (2709681).

Almost surely, 2^71775145 is an apocalyptic number.

It is an amenable number.

71775145 is a deficient number, since it is larger than the sum of its proper divisors (25773371).

71775145 is a wasteful number, since it uses less digits than its factorization.

71775145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190 (or 148 counting only the distinct ones).

The product of its digits is 34300, while the sum is 37.

The square root of 71775145 is about 8472.0213054501. The cubic root of 71775145 is about 415.5832414752.

The spelling of 71775145 in words is "seventy-one million, seven hundred seventy-five thousand, one hundred forty-five".