71755445 has 4 divisors (see below), whose sum is σ = 86106540. Its totient is φ = 57404352.

The previous prime is 71755441. The next prime is 71755493. The reversal of 71755445 is 54455717.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54455717 = 113 ⋅481909.

It can be written as a sum of positive squares in 2 ways, for example, as 54257956 + 17497489 = 7366^2 + 4183^2 .

It is a cyclic number.

It is not a de Polignac number, because 71755445 - 2² = 71755441 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 71755399 and 71755408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71755441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7175540 + ... + 7175549.

It is an arithmetic number, because the mean of its divisors is an integer number (21526635).

Almost surely, 2^71755445 is an apocalyptic number.

It is an amenable number.

71755445 is a deficient number, since it is larger than the sum of its proper divisors (14351095).

71755445 is a wasteful number, since it uses less digits than its factorization.

71755445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14351094.

The product of its digits is 98000, while the sum is 38.

The square root of 71755445 is about 8470.8585751387. The cubic root of 71755445 is about 415.5452165247.

The spelling of 71755445 in words is "seventy-one million, seven hundred fifty-five thousand, four hundred forty-five".