71682431 has 4 divisors (see below), whose sum is σ = 73619832. Its totient is φ = 69745032.

The previous prime is 71682409. The next prime is 71682449. The reversal of 71682431 is 13428617.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 71682431 - 2¹⁸ = 71420287 is a prime.

It is a super-2 number, since 2×71682431² = 10276741828139522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71682631) 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, 968645 + ... + 968718.

It is an arithmetic number, because the mean of its divisors is an integer number (18404958).

Almost surely, 2^71682431 is an apocalyptic number.

71682431 is a deficient number, since it is larger than the sum of its proper divisors (1937401).

71682431 is a wasteful number, since it uses less digits than its factorization.

71682431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1937400.

The product of its digits is 8064, while the sum is 32.

The square root of 71682431 is about 8466.5477616322. The cubic root of 71682431 is about 415.4042241341.

The spelling of 71682431 in words is "seventy-one million, six hundred eighty-two thousand, four hundred thirty-one".