68591525 has 24 divisors (see below), whose sum is σ = 90399720. Its totient is φ = 51528960.

The previous prime is 68591507. The next prime is 68591527. The reversal of 68591525 is 52519586.

It is a Cunningham number, because it is equal to 8282²+1.

It can be written as a sum of positive squares in 12 ways, for example, as 7219969 + 61371556 = 2687^2 + 7834^2 .

It is not a de Polignac number, because 68591525 - 2⁶ = 68591461 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68591527) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25547 + ... + 28103.

It is an arithmetic number, because the mean of its divisors is an integer number (3766655).

Almost surely, 2^68591525 is an apocalyptic number.

It is an amenable number.

68591525 is a deficient number, since it is larger than the sum of its proper divisors (21808195).

68591525 is a wasteful number, since it uses less digits than its factorization.

68591525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2633 (or 2628 counting only the distinct ones).

The product of its digits is 108000, while the sum is 41.

The square root of 68591525 is about 8282.0000603719. Note that the first 4 decimals coincide. The cubic root of 68591525 is about 409.3456247982.

The spelling of 68591525 in words is "sixty-eight million, five hundred ninety-one thousand, five hundred twenty-five".