67326521 has 4 divisors (see below), whose sum is σ = 67772544. Its totient is φ = 66880500.

The previous prime is 67326509. The next prime is 67326527. The reversal of 67326521 is 12562376.

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 67326521 - 2¹⁰ = 67325497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67326527) 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, 222785 + ... + 223086.

It is an arithmetic number, because the mean of its divisors is an integer number (16943136).

Almost surely, 2^67326521 is an apocalyptic number.

It is an amenable number.

67326521 is a deficient number, since it is larger than the sum of its proper divisors (446023).

67326521 is a wasteful number, since it uses less digits than its factorization.

67326521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 446022.

The product of its digits is 15120, while the sum is 32.

The square root of 67326521 is about 8205.2739747068. The cubic root of 67326521 is about 406.8135325340.

Adding to 67326521 its reverse (12562376), we get a palindrome (79888897).

The spelling of 67326521 in words is "sixty-seven million, three hundred twenty-six thousand, five hundred twenty-one".