68397988 has 6 divisors (see below), whose sum is σ = 119696486. Its totient is φ = 34198992.

The previous prime is 68397977. The next prime is 68398039. The reversal of 68397988 is 88979386.

It can be written as a sum of positive squares in only one way, i.e., 36385024 + 32012964 = 6032^2 + 5658^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8549745 + ... + 8549752.

Almost surely, 2^68397988 is an apocalyptic number.

It is an amenable number.

68397988 is a deficient number, since it is larger than the sum of its proper divisors (51298498).

68397988 is a wasteful number, since it uses less digits than its factorization.

68397988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17099501 (or 17099499 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 58.

The square root of 68397988 is about 8270.3076121750. The cubic root of 68397988 is about 408.9602606041.

The spelling of 68397988 in words is "sixty-eight million, three hundred ninety-seven thousand, nine hundred eighty-eight".