68440405 has 32 divisors (see below), whose sum is σ = 93477888. Its totient is φ = 47654400.

The previous prime is 68440397. The next prime is 68440423. The reversal of 68440405 is 50404486.

It is not a de Polignac number, because 68440405 - 2³ = 68440397 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 233439 + ... + 233731.

It is an arithmetic number, because the mean of its divisors is an integer number (2921184).

Almost surely, 2^68440405 is an apocalyptic number.

It is an amenable number.

68440405 is a deficient number, since it is larger than the sum of its proper divisors (25037483).

68440405 is a wasteful number, since it uses less digits than its factorization.

68440405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 477.

The product of its (nonzero) digits is 15360, while the sum is 31.

The square root of 68440405 is about 8272.8716296096. The cubic root of 68440405 is about 409.0447820120.

The spelling of 68440405 in words is "sixty-eight million, four hundred forty thousand, four hundred five".