71604553 has 4 divisors (see below), whose sum is σ = 71660160. Its totient is φ = 71548948.

The previous prime is 71604551. The next prime is 71604581. The reversal of 71604553 is 35540617.

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 a cyclic number.

It is not a de Polignac number, because 71604553 - 2¹ = 71604551 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71604551) 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, 25825 + ... + 28462.

It is an arithmetic number, because the mean of its divisors is an integer number (17915040).

Almost surely, 2^71604553 is an apocalyptic number.

It is an amenable number.

71604553 is a deficient number, since it is larger than the sum of its proper divisors (55607).

71604553 is a wasteful number, since it uses less digits than its factorization.

71604553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55606.

The product of its (nonzero) digits is 12600, while the sum is 31.

The square root of 71604553 is about 8461.9473527079. The cubic root of 71604553 is about 415.2537336423.

The spelling of 71604553 in words is "seventy-one million, six hundred four thousand, five hundred fifty-three".