71533645 has 4 divisors (see below), whose sum is σ = 85840380. Its totient is φ = 57226912.

The previous prime is 71533621. The next prime is 71533669. The reversal of 71533645 is 54633517.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (71533621) and next prime (71533669).

It can be written as a sum of positive squares in 2 ways, for example, as 28526281 + 43007364 = 5341^2 + 6558^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71533645 is a prime.

It is a super-3 number, since 3×71533645³ (a number of 25 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 71533645.

It is a congruent number.

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, 7153360 + ... + 7153369.

It is an arithmetic number, because the mean of its divisors is an integer number (21460095).

Almost surely, 2^71533645 is an apocalyptic number.

It is an amenable number.

71533645 is a deficient number, since it is larger than the sum of its proper divisors (14306735).

71533645 is a wasteful number, since it uses less digits than its factorization.

71533645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14306734.

The product of its digits is 37800, while the sum is 34.

The square root of 71533645 is about 8457.7564992142. The cubic root of 71533645 is about 415.1166169585.

The spelling of 71533645 in words is "seventy-one million, five hundred thirty-three thousand, six hundred forty-five".