71539245 has 24 divisors (see below), whose sum is σ = 125753472. Its totient is φ = 37615200.

The previous prime is 71539243. The next prime is 71539249. The reversal of 71539245 is 54293517.

It is not a de Polignac number, because 71539245 - 2¹ = 71539243 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71539243) 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, 8001 + ... + 14390.

It is an arithmetic number, because the mean of its divisors is an integer number (5239728).

Almost surely, 2^71539245 is an apocalyptic number.

It is an amenable number.

71539245 is a deficient number, since it is larger than the sum of its proper divisors (54214227).

71539245 is a wasteful number, since it uses less digits than its factorization.

71539245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22473 (or 22470 counting only the distinct ones).

The product of its digits is 37800, while the sum is 36.

The square root of 71539245 is about 8458.0875497952. The cubic root of 71539245 is about 415.1274491219.

The spelling of 71539245 in words is "seventy-one million, five hundred thirty-nine thousand, two hundred forty-five".