68240409 has 4 divisors (see below), whose sum is σ = 90987216. Its totient is φ = 45493604.

The previous prime is 68240407. The next prime is 68240413. The reversal of 68240409 is 90404286.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 68240409 - 2¹ = 68240407 is a prime.

It is a super-3 number, since 3×68240409³ (a number of 24 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 68240409.

It is not an unprimeable number, because it can be changed into a prime (68240401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11373399 + ... + 11373404.

It is an arithmetic number, because the mean of its divisors is an integer number (22746804).

Almost surely, 2^68240409 is an apocalyptic number.

It is an amenable number.

68240409 is a deficient number, since it is larger than the sum of its proper divisors (22746807).

68240409 is a wasteful number, since it uses less digits than its factorization.

68240409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22746806.

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 68240409 is about 8260.7753268080. The cubic root of 68240409 is about 408.6459574901.

The spelling of 68240409 in words is "sixty-eight million, two hundred forty thousand, four hundred nine".