71625617 has 4 divisors (see below), whose sum is σ = 81857856. Its totient is φ = 61393380.

The previous prime is 71625577. The next prime is 71625661. The reversal of 71625617 is 71652617.

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, and also an emirpimes, since its reverse is a distinct semiprime: 71652617 = 3407 ⋅21031.

It is a cyclic number.

It is not a de Polignac number, because 71625617 - 2¹⁰ = 71624593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71625667) 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, 5116109 + ... + 5116122.

It is an arithmetic number, because the mean of its divisors is an integer number (20464464).

Almost surely, 2^71625617 is an apocalyptic number.

It is an amenable number.

71625617 is a deficient number, since it is larger than the sum of its proper divisors (10232239).

71625617 is a wasteful number, since it uses less digits than its factorization.

71625617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10232238.

The product of its digits is 17640, while the sum is 35.

The square root of 71625617 is about 8463.1918919519. The cubic root of 71625617 is about 415.2944482185.

Subtracting 71625617 from its reverse (71652617), we obtain a cube (27000 = 30³).

The spelling of 71625617 in words is "seventy-one million, six hundred twenty-five thousand, six hundred seventeen".