71138542 has 32 divisors (see below), whose sum is σ = 112803840. Its totient is φ = 33616800.

The previous prime is 71138533. The next prime is 71138549. The reversal of 71138542 is 24583117.

Its product of digits (6720) is a multiple of the sum of its prime divisors (336).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71138549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 560083 + ... + 560209.

It is an arithmetic number, because the mean of its divisors is an integer number (3525120).

Almost surely, 2^71138542 is an apocalyptic number.

71138542 is a deficient number, since it is larger than the sum of its proper divisors (41665298).

71138542 is a wasteful number, since it uses less digits than its factorization.

71138542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336.

The product of its digits is 6720, while the sum is 31.

The square root of 71138542 is about 8434.3667219300. The cubic root of 71138542 is about 414.3509319557.

The spelling of 71138542 in words is "seventy-one million, one hundred thirty-eight thousand, five hundred forty-two".