71205138 has 24 divisors (see below), whose sum is σ = 154630476. Its totient is φ = 23680800.

The previous prime is 71205097. The next prime is 71205139. The reversal of 71205138 is 83150217.

It can be written as a sum of positive squares in 2 ways, for example, as 56205009 + 15000129 = 7497^2 + 3873^2 .

It is not an unprimeable number, because it can be changed into a prime (71205139) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4008 + ... + 12588.

Almost surely, 2^71205138 is an apocalyptic number.

71205138 is an abundant number, since it is smaller than the sum of its proper divisors (83425338).

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

71205138 is a wasteful number, since it uses less digits than its factorization.

71205138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9050 (or 9047 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 71205138 is about 8438.3136940979. The cubic root of 71205138 is about 414.4801891660.

It can be divided in two parts, 71 and 205138, that added together give a square (205209 = 453²).

The spelling of 71205138 in words is "seventy-one million, two hundred five thousand, one hundred thirty-eight".