67081387 has 4 divisors (see below), whose sum is σ = 67097800. Its totient is φ = 67064976.

The previous prime is 67081351. The next prime is 67081393. The reversal of 67081387 is 78318076.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67081387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67081687) 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, 3343 + ... + 12055.

It is an arithmetic number, because the mean of its divisors is an integer number (16774450).

Almost surely, 2^67081387 is an apocalyptic number.

67081387 is a deficient number, since it is larger than the sum of its proper divisors (16413).

67081387 is an equidigital number, since it uses as much as digits as its factorization.

67081387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16412.

The product of its (nonzero) digits is 56448, while the sum is 40.

The square root of 67081387 is about 8190.3227653127. The cubic root of 67081387 is about 406.3191998254.

The spelling of 67081387 in words is "sixty-seven million, eighty-one thousand, three hundred eighty-seven".