71745745 has 4 divisors (see below), whose sum is σ = 86094900. Its totient is φ = 57396592.

The previous prime is 71745743. The next prime is 71745757. The reversal of 71745745 is 54754717.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 45037521 + 26708224 = 6711^2 + 5168^2 .

It is a cyclic number.

It is not a de Polignac number, because 71745745 - 2¹ = 71745743 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 71745698 and 71745707.

It is not an unprimeable number, because it can be changed into a prime (71745743) 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, 7174570 + ... + 7174579.

It is an arithmetic number, because the mean of its divisors is an integer number (21523725).

Almost surely, 2^71745745 is an apocalyptic number.

It is an amenable number.

71745745 is a deficient number, since it is larger than the sum of its proper divisors (14349155).

71745745 is a wasteful number, since it uses less digits than its factorization.

71745745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14349154.

The product of its digits is 137200, while the sum is 40.

The square root of 71745745 is about 8470.2860046164. The cubic root of 71745745 is about 415.5264910225.

The spelling of 71745745 in words is "seventy-one million, seven hundred forty-five thousand, seven hundred forty-five".