71721055 has 24 divisors (see below), whose sum is σ = 101779200. Its totient is φ = 48363840.

The previous prime is 71720959. The next prime is 71721071. The reversal of 71721055 is 55012717.

It is not a de Polignac number, because 71721055 - 2¹¹ = 71719007 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12546 + ... + 17344.

It is an arithmetic number, because the mean of its divisors is an integer number (4240800).

Almost surely, 2^71721055 is an apocalyptic number.

71721055 is a deficient number, since it is larger than the sum of its proper divisors (30058145).

71721055 is a wasteful number, since it uses less digits than its factorization.

71721055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4879 (or 4872 counting only the distinct ones).

The product of its (nonzero) digits is 2450, while the sum is 28.

The square root of 71721055 is about 8468.8284313711. The cubic root of 71721055 is about 415.4788202459.

The spelling of 71721055 in words is "seventy-one million, seven hundred twenty-one thousand, fifty-five".