68815280 has 40 divisors (see below), whose sum is σ = 160345392. Its totient is φ = 27465984.

The previous prime is 68815249. The next prime is 68815291. The reversal of 68815280 is 8251886.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×68815280² = 9471085522956800, which contains 22 as substring.

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, 62414 + ... + 63506.

Almost surely, 2^68815280 is an apocalyptic number.

It is an amenable number.

68815280 is an abundant number, since it is smaller than the sum of its proper divisors (91530112).

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

68815280 is a wasteful number, since it uses less digits than its factorization.

68815280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1893 (or 1887 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 38.

The square root of 68815280 is about 8295.4975739855. The cubic root of 68815280 is about 409.7902555982.

The spelling of 68815280 in words is "sixty-eight million, eight hundred fifteen thousand, two hundred eighty".