71536821 has 16 divisors (see below), whose sum is σ = 98624064. Its totient is φ = 46093824.

The previous prime is 71536819. The next prime is 71536847. The reversal of 71536821 is 12863517.

It is not a de Polignac number, because 71536821 - 2¹ = 71536819 is a prime.

It is a super-3 number, since 3×71536821³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71536921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9655 + ... + 15371.

It is an arithmetic number, because the mean of its divisors is an integer number (6164004).

Almost surely, 2^71536821 is an apocalyptic number.

It is an amenable number.

71536821 is a deficient number, since it is larger than the sum of its proper divisors (27087243).

71536821 is a wasteful number, since it uses less digits than its factorization.

71536821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5860.

The product of its digits is 10080, while the sum is 33.

The square root of 71536821 is about 8457.9442537770. The cubic root of 71536821 is about 415.1227604120.

The spelling of 71536821 in words is "seventy-one million, five hundred thirty-six thousand, eight hundred twenty-one".