71642549 has 8 divisors (see below), whose sum is σ = 78244320. Its totient is φ = 65055600.

The previous prime is 71642537. The next prime is 71642561. The reversal of 71642549 is 94524617.

It is an interprime number because it is at equal distance from previous prime (71642537) and next prime (71642561).

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

It is a cyclic number.

It is not a de Polignac number, because 71642549 - 2⁴ = 71642533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71642569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8042 + ... + 14420.

It is an arithmetic number, because the mean of its divisors is an integer number (9780540).

Almost surely, 2^71642549 is an apocalyptic number.

It is an amenable number.

71642549 is a deficient number, since it is larger than the sum of its proper divisors (6601771).

71642549 is a wasteful number, since it uses less digits than its factorization.

71642549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7411.

The product of its digits is 60480, while the sum is 38.

The square root of 71642549 is about 8464.1921646428. The cubic root of 71642549 is about 415.3271702709.

The spelling of 71642549 in words is "seventy-one million, six hundred forty-two thousand, five hundred forty-nine".