68400409 has 16 divisors (see below), whose sum is σ = 85478400. Its totient is φ = 53174160.

The previous prime is 68400403. The next prime is 68400419. The reversal of 68400409 is 90400486.

It is a cyclic number.

It is not a de Polignac number, because 68400409 - 2⁵ = 68400377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (68400403) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45382 + ... + 46864.

It is an arithmetic number, because the mean of its divisors is an integer number (5342400).

Almost surely, 2^68400409 is an apocalyptic number.

It is an amenable number.

68400409 is a deficient number, since it is larger than the sum of its proper divisors (17077991).

68400409 is a wasteful number, since it uses less digits than its factorization.

68400409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2100.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 68400409 is about 8270.4539778660. The cubic root of 68400409 is about 408.9650857027.

The spelling of 68400409 in words is "sixty-eight million, four hundred thousand, four hundred nine".