71231638 has 8 divisors (see below), whose sum is σ = 106884288. Its totient is φ = 35603544.

The previous prime is 71231617. The next prime is 71231639. The reversal of 71231638 is 83613217.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71231639) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5620 + ... + 13192.

It is an arithmetic number, because the mean of its divisors is an integer number (13360536).

Almost surely, 2^71231638 is an apocalyptic number.

71231638 is a deficient number, since it is larger than the sum of its proper divisors (35652650).

71231638 is a wasteful number, since it uses less digits than its factorization.

71231638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12278.

The product of its digits is 6048, while the sum is 31.

The square root of 71231638 is about 8439.8837669721. The cubic root of 71231638 is about 414.5316010117.

The spelling of 71231638 in words is "seventy-one million, two hundred thirty-one thousand, six hundred thirty-eight".