71755945 has 8 divisors (see below), whose sum is σ = 88207560. Its totient is φ = 56004480.

The previous prime is 71755921. The next prime is 71755961. The reversal of 71755945 is 54955717.

It can be written as a sum of positive squares in 4 ways, for example, as 2849344 + 68906601 = 1688^2 + 8301^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 71755945 - 2²¹ = 69658793 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 174810 + ... + 175219.

It is an arithmetic number, because the mean of its divisors is an integer number (11025945).

Almost surely, 2^71755945 is an apocalyptic number.

It is an amenable number.

71755945 is a deficient number, since it is larger than the sum of its proper divisors (16451615).

71755945 is a wasteful number, since it uses less digits than its factorization.

71755945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350075.

The product of its digits is 220500, while the sum is 43.

The square root of 71755945 is about 8470.8880880342. Note that the first 3 decimals coincide. The cubic root of 71755945 is about 415.5461817111.

The spelling of 71755945 in words is "seventy-one million, seven hundred fifty-five thousand, nine hundred forty-five".