68644745 has 8 divisors (see below), whose sum is σ = 88710216. Its totient is φ = 50691456.

The previous prime is 68644661. The next prime is 68644787. The reversal of 68644745 is 54744686.

It can be written as a sum of positive squares in 4 ways, for example, as 1207801 + 67436944 = 1099^2 + 8212^2 .

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 68644745 - 2¹⁶ = 68579209 is a prime.

It is a super-2 number, since 2×68644745² = 9424202032230050, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 68644696 and 68644705.

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, 527972 + ... + 528101.

It is an arithmetic number, because the mean of its divisors is an integer number (11088777).

Almost surely, 2^68644745 is an apocalyptic number.

68644745 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

68644745 is a deficient number, since it is larger than the sum of its proper divisors (20065471).

68644745 is a wasteful number, since it uses less digits than its factorization.

68644745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1056091.

The product of its digits is 645120, while the sum is 44.

The square root of 68644745 is about 8285.2124293828. The cubic root of 68644745 is about 409.4514675252.

The spelling of 68644745 in words is "sixty-eight million, six hundred forty-four thousand, seven hundred forty-five".