71531438 has 16 divisors (see below), whose sum is σ = 117186480. Its totient is φ = 32476800.

The previous prime is 71531431. The next prime is 71531441. The reversal of 71531438 is 83413517.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71531431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28748 + ... + 31136.

It is an arithmetic number, because the mean of its divisors is an integer number (7324155).

Almost surely, 2^71531438 is an apocalyptic number.

71531438 is a deficient number, since it is larger than the sum of its proper divisors (45655042).

71531438 is a wasteful number, since it uses less digits than its factorization.

71531438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3763.

The product of its digits is 10080, while the sum is 32.

The square root of 71531438 is about 8457.6260262558. The cubic root of 71531438 is about 415.1123477702.

The spelling of 71531438 in words is "seventy-one million, five hundred thirty-one thousand, four hundred thirty-eight".