71544564 has 72 divisors (see below), whose sum is σ = 222593280. Its totient is φ = 18868032.

The previous prime is 71544563. The next prime is 71544593. The reversal of 71544564 is 46544517.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71544563) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7644 + ... + 14195.

Almost surely, 2^71544564 is an apocalyptic number.

It is an amenable number.

71544564 is an abundant number, since it is smaller than the sum of its proper divisors (151048716).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71544564 is a wasteful number, since it uses less digits than its factorization.

71544564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21869 (or 21864 counting only the distinct ones).

The product of its digits is 67200, while the sum is 36.

The square root of 71544564 is about 8458.4019767330. The cubic root of 71544564 is about 415.1377372194.

The spelling of 71544564 in words is "seventy-one million, five hundred forty-four thousand, five hundred sixty-four".