71742621 has 4 divisors (see below), whose sum is σ = 95656832. Its totient is φ = 47828412.

The previous prime is 71742617. The next prime is 71742637. The reversal of 71742621 is 12624717.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 71742621 - 2² = 71742617 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71742641) 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 3 ways as a sum of consecutive naturals, for example, 11957101 + ... + 11957106.

It is an arithmetic number, because the mean of its divisors is an integer number (23914208).

Almost surely, 2^71742621 is an apocalyptic number.

It is an amenable number.

71742621 is a deficient number, since it is larger than the sum of its proper divisors (23914211).

71742621 is a wasteful number, since it uses less digits than its factorization.

71742621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23914210.

The product of its digits is 4704, while the sum is 30.

The square root of 71742621 is about 8470.1015932514. The cubic root of 71742621 is about 415.5204598931.

The spelling of 71742621 in words is "seventy-one million, seven hundred forty-two thousand, six hundred twenty-one".