68507720 has 64 divisors (see below), whose sum is σ = 162313200. Its totient is φ = 25989120.

The previous prime is 68507707. The next prime is 68507741. The reversal of 68507720 is 2770586.

It can be written as a sum of positive squares in 8 ways, for example, as 11142244 + 57365476 = 3338^2 + 7574^2 .

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60116 + ... + 61244.

Almost surely, 2^68507720 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68507720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81156600).

68507720 is an abundant number, since it is smaller than the sum of its proper divisors (93805480).

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

68507720 is a wasteful number, since it uses less digits than its factorization.

68507720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1218 (or 1214 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 35.

The square root of 68507720 is about 8276.9390477398. The cubic root of 68507720 is about 409.1788442767.

The spelling of 68507720 in words is "sixty-eight million, five hundred seven thousand, seven hundred twenty".