67289381 has 4 divisors (see below), whose sum is σ = 67337772. Its totient is φ = 67240992.

The previous prime is 67289351. The next prime is 67289389. The reversal of 67289381 is 18398276.

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 37761025 + 29528356 = 6145^2 + 5434^2 .

It is a cyclic number.

It is not a de Polignac number, because 67289381 - 2¹⁰ = 67288357 is a prime.

It is a super-2 number, since 2×67289381² = 9055721590726322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67289389) 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, 22046 + ... + 24911.

It is an arithmetic number, because the mean of its divisors is an integer number (16834443).

Almost surely, 2^67289381 is an apocalyptic number.

It is an amenable number.

67289381 is a deficient number, since it is larger than the sum of its proper divisors (48391).

67289381 is a wasteful number, since it uses less digits than its factorization.

67289381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48390.

The product of its digits is 145152, while the sum is 44.

The square root of 67289381 is about 8203.0104839626. The cubic root of 67289381 is about 406.7387139064.

The spelling of 67289381 in words is "sixty-seven million, two hundred eighty-nine thousand, three hundred eighty-one".