68129280 has 120 divisors (see below), whose sum is σ = 236030652. Its totient is φ = 18161664.

The previous prime is 68129279. The next prime is 68129287. The reversal of 68129280 is 8292186.

It can be written as a sum of positive squares in 2 ways, for example, as 64256256 + 3873024 = 8016^2 + 1968^2 .

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (68129287) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21562 + ... + 24518.

Almost surely, 2^68129280 is an apocalyptic number.

68129280 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 68129280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (118015326).

68129280 is an abundant number, since it is smaller than the sum of its proper divisors (167901372).

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

68129280 is a wasteful number, since it uses less digits than its factorization.

68129280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2986 (or 2967 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 68129280 is about 8254.0462804615. The cubic root of 68129280 is about 408.4240113301.

The spelling of 68129280 in words is "sixty-eight million, one hundred twenty-nine thousand, two hundred eighty".