71582421 has 8 divisors (see below), whose sum is σ = 95496544. Its totient is φ = 47694960.

The previous prime is 71582389. The next prime is 71582447. The reversal of 71582421 is 12428517.

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

It is not a de Polignac number, because 71582421 - 2⁵ = 71582389 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71582471) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 795 + ... + 11991.

It is an arithmetic number, because the mean of its divisors is an integer number (11937068).

Almost surely, 2^71582421 is an apocalyptic number.

It is an amenable number.

71582421 is a deficient number, since it is larger than the sum of its proper divisors (23914123).

71582421 is a wasteful number, since it uses less digits than its factorization.

71582421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13331.

The product of its digits is 4480, while the sum is 30.

The square root of 71582421 is about 8460.6395148357. The cubic root of 71582421 is about 415.2109461272.

The spelling of 71582421 in words is "seventy-one million, five hundred eighty-two thousand, four hundred twenty-one".