71488321 has 4 divisors (see below), whose sum is σ = 72225412. Its totient is φ = 70751232.

The previous prime is 71488309. The next prime is 71488343. The reversal of 71488321 is 12388417.

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 31798321 + 39690000 = 5639^2 + 6300^2 .

It is a cyclic number.

It is not a de Polignac number, because 71488321 - 2⁵ = 71488289 is a prime.

It is a super-2 number, since 2×71488321² = 10221160078798082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71488121) 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, 368400 + ... + 368593.

It is an arithmetic number, because the mean of its divisors is an integer number (18056353).

Almost surely, 2^71488321 is an apocalyptic number.

It is an amenable number.

71488321 is a deficient number, since it is larger than the sum of its proper divisors (737091).

71488321 is an equidigital number, since it uses as much as digits as its factorization.

71488321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 737090.

The product of its digits is 10752, while the sum is 34.

The square root of 71488321 is about 8455.0766406934. The cubic root of 71488321 is about 415.0289252592.

The spelling of 71488321 in words is "seventy-one million, four hundred eighty-eight thousand, three hundred twenty-one".