71621753 has 8 divisors (see below), whose sum is σ = 82283520. Its totient is φ = 61067520.

The previous prime is 71621743. The next prime is 71621801. The reversal of 71621753 is 35712617.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71621753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71621713) 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, 25448 + ... + 28121.

It is an arithmetic number, because the mean of its divisors is an integer number (10285440).

Almost surely, 2^71621753 is an apocalyptic number.

It is an amenable number.

71621753 is a deficient number, since it is larger than the sum of its proper divisors (10661767).

71621753 is a wasteful number, since it uses less digits than its factorization.

71621753 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53767.

The product of its digits is 8820, while the sum is 32.

The square root of 71621753 is about 8462.9636062079. The cubic root of 71621753 is about 415.2869800962.

The spelling of 71621753 in words is "seventy-one million, six hundred twenty-one thousand, seven hundred fifty-three".