68643445 has 8 divisors (see below), whose sum is σ = 88708536. Its totient is φ = 50690496.

The previous prime is 68643401. The next prime is 68643451. The reversal of 68643445 is 54434686.

It can be written as a sum of positive squares in 4 ways, for example, as 630436 + 68013009 = 794^2 + 8247^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 68643445 - 2⁷ = 68643317 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 68643398 and 68643407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 527962 + ... + 528091.

It is an arithmetic number, because the mean of its divisors is an integer number (11088567).

Almost surely, 2^68643445 is an apocalyptic number.

68643445 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

68643445 is a deficient number, since it is larger than the sum of its proper divisors (20065091).

68643445 is a wasteful number, since it uses less digits than its factorization.

68643445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1056071.

The product of its digits is 276480, while the sum is 40.

The square root of 68643445 is about 8285.1339759837. The cubic root of 68643445 is about 409.4488827667.

The spelling of 68643445 in words is "sixty-eight million, six hundred forty-three thousand, four hundred forty-five".