67067621 has 4 divisors (see below), whose sum is σ = 67085100. Its totient is φ = 67050144.

The previous prime is 67067599. The next prime is 67067629. The reversal of 67067621 is 12676076.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 32092225 + 34975396 = 5665^2 + 5914^2 .

It is a cyclic number.

It is not a de Polignac number, because 67067621 - 2¹⁸ = 66805477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67067629) 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, 206 + ... + 11583.

It is an arithmetic number, because the mean of its divisors is an integer number (16771275).

Almost surely, 2^67067621 is an apocalyptic number.

It is an amenable number.

67067621 is a deficient number, since it is larger than the sum of its proper divisors (17479).

67067621 is a wasteful number, since it uses less digits than its factorization.

67067621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17478.

The product of its (nonzero) digits is 21168, while the sum is 35.

The square root of 67067621 is about 8189.4823401727. The cubic root of 67067621 is about 406.2914038748.

The spelling of 67067621 in words is "sixty-seven million, sixty-seven thousand, six hundred twenty-one".