68137984 has 22 divisors (see below), whose sum is σ = 136211474. Its totient is φ = 34068480.

The previous prime is 68137967. The next prime is 68137987. The reversal of 68137984 is 48973186.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 66064384 + 2073600 = 8128^2 + 1440^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68137987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32247 + ... + 34294.

Almost surely, 2^68137984 is an apocalyptic number.

68137984 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

68137984 is a deficient number, since it is larger than the sum of its proper divisors (68073490).

68137984 is an equidigital number, since it uses as much as digits as its factorization.

68137984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66561 (or 66543 counting only the distinct ones).

The product of its digits is 290304, while the sum is 46.

The square root of 68137984 is about 8254.5735201766. The cubic root of 68137984 is about 408.4414036134.

The spelling of 68137984 in words is "sixty-eight million, one hundred thirty-seven thousand, nine hundred eighty-four".