71506438 has 4 divisors (see below), whose sum is σ = 107259660. Its totient is φ = 35753218.

The previous prime is 71506433. The next prime is 71506439. The reversal of 71506438 is 83460517.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83460517 = 7 ⋅11922931.

It is a super-2 number, since 2×71506438² = 10226341350895688, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71506433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17876608 + ... + 17876611.

It is an arithmetic number, because the mean of its divisors is an integer number (26814915).

Almost surely, 2^71506438 is an apocalyptic number.

71506438 is a deficient number, since it is larger than the sum of its proper divisors (35753222).

71506438 is a wasteful number, since it uses less digits than its factorization.

71506438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35753221.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 71506438 is about 8456.1479409954. The cubic root of 71506438 is about 415.0639820063.

The spelling of 71506438 in words is "seventy-one million, five hundred six thousand, four hundred thirty-eight".