68240456 has 16 divisors (see below), whose sum is σ = 130049340. Its totient is φ = 33560640.

The previous prime is 68240449. The next prime is 68240461. The reversal of 68240456 is 65404286.

It can be written as a sum of positive squares in 2 ways, for example, as 58216900 + 10023556 = 7630^2 + 3166^2 .

It is a super-3 number, since 3×68240456³ (a number of 24 digits) contains 333 as substring.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 69431 + ... + 70406.

Almost surely, 2^68240456 is an apocalyptic number.

It is an amenable number.

68240456 is a deficient number, since it is larger than the sum of its proper divisors (61808884).

68240456 is a wasteful number, since it uses less digits than its factorization.

68240456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139904 (or 139900 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 35.

The square root of 68240456 is about 8260.7781715768. The cubic root of 68240456 is about 408.6460513072.

The spelling of 68240456 in words is "sixty-eight million, two hundred forty thousand, four hundred fifty-six".