68040405 has 40 divisors (see below), whose sum is σ = 124837152. Its totient is φ = 35435232.

The previous prime is 68040389. The next prime is 68040421. The reversal of 68040405 is 50404086.

It is an interprime number because it is at equal distance from previous prime (68040389) and next prime (68040421).

It is not a de Polignac number, because 68040405 - 2⁴ = 68040389 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

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 39 ways as a sum of consecutive naturals, for example, 15462 + ... + 19368.

Almost surely, 2^68040405 is an apocalyptic number.

It is an amenable number.

68040405 is a deficient number, since it is larger than the sum of its proper divisors (56796747).

68040405 is a wasteful number, since it uses less digits than its factorization.

68040405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3967 (or 3958 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 68040405 is about 8248.6608003966. The cubic root of 68040405 is about 408.2463369666.

The spelling of 68040405 in words is "sixty-eight million, forty thousand, four hundred five".