71139312 has 30 divisors (see below), whose sum is σ = 199091672. Its totient is φ = 23713056.

The previous prime is 71139311. The next prime is 71139323. The reversal of 71139312 is 21393117.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71139311) 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 5 ways as a sum of consecutive naturals, for example, 246868 + ... + 247155.

Almost surely, 2^71139312 is an apocalyptic number.

71139312 is a gapful number since it is divisible by the number (72) formed by its first and last digit.

It is an amenable number.

71139312 is an abundant number, since it is smaller than the sum of its proper divisors (127952360).

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

71139312 is a wasteful number, since it uses less digits than its factorization.

71139312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 494037 (or 494028 counting only the distinct ones).

The product of its digits is 1134, while the sum is 27.

The square root of 71139312 is about 8434.4123683870. The cubic root of 71139312 is about 414.3524269216.

The spelling of 71139312 in words is "seventy-one million, one hundred thirty-nine thousand, three hundred twelve".