67644361 has 8 divisors (see below), whose sum is σ = 68877000. Its totient is φ = 66422400.

The previous prime is 67644359. The next prime is 67644407. The reversal of 67644361 is 16344676.

It can be written as a sum of positive squares in 4 ways, for example, as 9030025 + 58614336 = 3005^2 + 7656^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 67644361 - 2¹ = 67644359 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 67644361.

It is not an unprimeable number, because it can be changed into a prime (67644341) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10711 + ... + 15811.

It is an arithmetic number, because the mean of its divisors is an integer number (8609625).

Almost surely, 2^67644361 is an apocalyptic number.

It is an amenable number.

67644361 is a deficient number, since it is larger than the sum of its proper divisors (1232639).

67644361 is a wasteful number, since it uses less digits than its factorization.

67644361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5339.

The product of its digits is 72576, while the sum is 37.

The square root of 67644361 is about 8224.6192009114. The cubic root of 67644361 is about 407.4526995420.

The spelling of 67644361 in words is "sixty-seven million, six hundred forty-four thousand, three hundred sixty-one".