71720055 has 24 divisors (see below), whose sum is σ = 135617040. Its totient is φ = 34773120.

The previous prime is 71720039. The next prime is 71720057. The reversal of 71720055 is 55002717.

It is not a de Polignac number, because 71720055 - 2⁴ = 71720039 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71720057) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 71950 + ... + 72939.

It is an arithmetic number, because the mean of its divisors is an integer number (5650710).

Almost surely, 2^71720055 is an apocalyptic number.

71720055 is a deficient number, since it is larger than the sum of its proper divisors (63896985).

71720055 is a wasteful number, since it uses less digits than its factorization.

71720055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144911 (or 144908 counting only the distinct ones).

The product of its (nonzero) digits is 2450, while the sum is 27.

The square root of 71720055 is about 8468.7693911217. The cubic root of 71720055 is about 415.4768892427.

The spelling of 71720055 in words is "seventy-one million, seven hundred twenty thousand, fifty-five".