68240408 has 8 divisors (see below), whose sum is σ = 127950780. Its totient is φ = 34120200.

The previous prime is 68240407. The next prime is 68240413. The reversal of 68240408 is 80404286.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-3 number, since 3×68240408³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

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

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4265018 + ... + 4265033.

Almost surely, 2^68240408 is an apocalyptic number.

It is an amenable number.

68240408 is a deficient number, since it is larger than the sum of its proper divisors (59710372).

68240408 is a wasteful number, since it uses less digits than its factorization.

68240408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8530057 (or 8530053 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 32.

The square root of 68240408 is about 8260.7752662810. The cubic root of 68240408 is about 408.6459554940.

The spelling of 68240408 in words is "sixty-eight million, two hundred forty thousand, four hundred eight".