67788381 has 8 divisors (see below), whose sum is σ = 90422560. Its totient is φ = 45173232.

The previous prime is 67788379. The next prime is 67788397. The reversal of 67788381 is 18388776.

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

It is not a de Polignac number, because 67788381 - 2¹ = 67788379 is a prime.

It is a super-2 number, since 2×67788381² = 9190529197202322, which contains 22 as substring.

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 67788381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67788481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11355 + ... + 16263.

It is an arithmetic number, because the mean of its divisors is an integer number (11302820).

Almost surely, 2^67788381 is an apocalyptic number.

It is an amenable number.

67788381 is a deficient number, since it is larger than the sum of its proper divisors (22634179).

67788381 is a wasteful number, since it uses less digits than its factorization.

67788381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9515.

The product of its digits is 451584, while the sum is 48.

The square root of 67788381 is about 8233.3699661803. The cubic root of 67788381 is about 407.7416605159.

The spelling of 67788381 in words is "sixty-seven million, seven hundred eighty-eight thousand, three hundred eighty-one".