68515980 has 144 divisors (see below), whose sum is σ = 215822880. Its totient is φ = 16214016.

The previous prime is 68515969. The next prime is 68515987. The reversal of 68515980 is 8951586.

It is not an unprimeable number, because it can be changed into a prime (68515987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 293944 + ... + 294176.

It is an arithmetic number, because the mean of its divisors is an integer number (1498770).

Almost surely, 2^68515980 is an apocalyptic number.

68515980 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68515980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107911440).

68515980 is an abundant number, since it is smaller than the sum of its proper divisors (147306900).

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

68515980 is a wasteful number, since it uses less digits than its factorization.

68515980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300 (or 285 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 42.

The square root of 68515980 is about 8277.4380094326. The cubic root of 68515980 is about 409.1952885617.

The spelling of 68515980 in words is "sixty-eight million, five hundred fifteen thousand, nine hundred eighty".