71772543 has 6 divisors (see below), whose sum is σ = 103671464. Its totient is φ = 47848356.

The previous prime is 71772523. The next prime is 71772577. The reversal of 71772543 is 34527717.

It is not a de Polignac number, because 71772543 - 2¹⁸ = 71510399 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71772498 and 71772507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71772523) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3987355 + ... + 3987372.

Almost surely, 2^71772543 is an apocalyptic number.

71772543 is a deficient number, since it is larger than the sum of its proper divisors (31898921).

71772543 is a wasteful number, since it uses less digits than its factorization.

71772543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7974733 (or 7974730 counting only the distinct ones).

The product of its digits is 41160, while the sum is 36.

The square root of 71772543 is about 8471.8677397608. The cubic root of 71772543 is about 415.5782194922.

The spelling of 71772543 in words is "seventy-one million, seven hundred seventy-two thousand, five hundred forty-three".