67668405 has 64 divisors (see below), whose sum is σ = 131880960. Its totient is φ = 28940544.

The previous prime is 67668401. The next prime is 67668407. The reversal of 67668405 is 50486676.

It is a happy number.

It is not a de Polignac number, because 67668405 - 2² = 67668401 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67668401) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 213307 + ... + 213623.

It is an arithmetic number, because the mean of its divisors is an integer number (2060640).

Almost surely, 2^67668405 is an apocalyptic number.

It is an amenable number.

67668405 is a deficient number, since it is larger than the sum of its proper divisors (64212555).

67668405 is a wasteful number, since it uses less digits than its factorization.

67668405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 458.

The product of its (nonzero) digits is 241920, while the sum is 42.

The square root of 67668405 is about 8226.0807800556. The cubic root of 67668405 is about 407.5009697996.

The spelling of 67668405 in words is "sixty-seven million, six hundred sixty-eight thousand, four hundred five".