71139705 has 96 divisors (see below), whose sum is σ = 148976640. Its totient is φ = 28304640.

The previous prime is 71139701. The next prime is 71139707. The reversal of 71139705 is 50793117.

It is not a de Polignac number, because 71139705 - 2² = 71139701 is a prime.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (71139701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 337050 + ... + 337260.

It is an arithmetic number, because the mean of its divisors is an integer number (1551840).

Almost surely, 2^71139705 is an apocalyptic number.

It is an amenable number.

71139705 is an abundant number, since it is smaller than the sum of its proper divisors (77836935).

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

71139705 is a wasteful number, since it uses less digits than its factorization.

71139705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271 (or 258 counting only the distinct ones).

The product of its (nonzero) digits is 6615, while the sum is 33.

The square root of 71139705 is about 8434.4356657692. The cubic root of 71139705 is about 414.3531899324.

The spelling of 71139705 in words is "seventy-one million, one hundred thirty-nine thousand, seven hundred five".