68508720 has 320 divisors, whose sum is σ = 282839040. Its totient is φ = 14902272.

The previous prime is 68508709. The next prime is 68508731. The reversal of 68508720 is 2780586.

It is an interprime number because it is at equal distance from previous prime (68508709) and next prime (68508731).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 347662 + ... + 347858.

It is an arithmetic number, because the mean of its divisors is an integer number (883872).

Almost surely, 2^68508720 is an apocalyptic number.

68508720 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 68508720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (141419520).

68508720 is an abundant number, since it is smaller than the sum of its proper divisors (214330320).

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

68508720 is a wasteful number, since it uses less digits than its factorization.

68508720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249 (or 237 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 68508720 is about 8276.9994563247. Note that the first 3 decimals coincide. The cubic root of 68508720 is about 409.1808351806.

The spelling of 68508720 in words is "sixty-eight million, five hundred eight thousand, seven hundred twenty".