71721004 has 12 divisors (see below), whose sum is σ = 126214200. Its totient is φ = 35659808.

The previous prime is 71720959. The next prime is 71721071. The reversal of 71721004 is 40012717.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49369 + ... + 50800.

It is an arithmetic number, because the mean of its divisors is an integer number (10517850).

Almost surely, 2^71721004 is an apocalyptic number.

It is an amenable number.

71721004 is a deficient number, since it is larger than the sum of its proper divisors (54493196).

71721004 is a wasteful number, since it uses less digits than its factorization.

71721004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100352 (or 100350 counting only the distinct ones).

The product of its (nonzero) digits is 392, while the sum is 22.

The square root of 71721004 is about 8468.8254203284. The cubic root of 71721004 is about 415.4787217651.

The spelling of 71721004 in words is "seventy-one million, seven hundred twenty-one thousand, four".