68643738 has 48 divisors (see below), whose sum is σ = 153575136. Its totient is φ = 22145760.

The previous prime is 68643737. The next prime is 68643779. The reversal of 68643738 is 83734686.

It is a super-2 number, since 2×68643738² = 9423925533225288, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 68643693 and 68643702.

It is not an unprimeable number, because it can be changed into a prime (68643737) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 101056 + ... + 101732.

It is an arithmetic number, because the mean of its divisors is an integer number (3199482).

Almost surely, 2^68643738 is an apocalyptic number.

68643738 is an abundant number, since it is smaller than the sum of its proper divisors (84931398).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

68643738 is a wasteful number, since it uses less digits than its factorization.

68643738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 859 (or 856 counting only the distinct ones).

The product of its digits is 580608, while the sum is 45.

The square root of 68643738 is about 8285.1516582378. The cubic root of 68643738 is about 409.4494653343.

The spelling of 68643738 in words is "sixty-eight million, six hundred forty-three thousand, seven hundred thirty-eight".