68981380 has 24 divisors (see below), whose sum is σ = 156004632. Its totient is φ = 25469952.

The previous prime is 68981377. The next prime is 68981389. The reversal of 68981380 is 8318986.

68981380 = 306² + 307² + ... + 617².

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 24964 + 68956416 = 158^2 + 8304^2 .

It is not an unprimeable number, because it can be changed into a prime (68981389) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 132397 + ... + 132916.

It is an arithmetic number, because the mean of its divisors is an integer number (6500193).

Almost surely, 2^68981380 is an apocalyptic number.

It is an amenable number.

68981380 is an abundant number, since it is smaller than the sum of its proper divisors (87023252).

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

68981380 is a wasteful number, since it uses less digits than its factorization.

68981380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265335 (or 265333 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 43.

The square root of 68981380 is about 8305.5029950028. The cubic root of 68981380 is about 410.1196953720.

The spelling of 68981380 in words is "sixty-eight million, nine hundred eighty-one thousand, three hundred eighty".