68136720 has 80 divisors (see below), whose sum is σ = 212462592. Its totient is φ = 18063360.

The previous prime is 68136703. The next prime is 68136743. The reversal of 68136720 is 2763186.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×68136720² = 9285225224716800, which contains 22 as substring.

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, 45585 + ... + 47055.

Almost surely, 2^68136720 is an apocalyptic number.

68136720 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 68136720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106231296).

68136720 is an abundant number, since it is smaller than the sum of its proper divisors (144325872).

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

68136720 is a wasteful number, since it uses less digits than its factorization.

68136720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1680 (or 1674 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 68136720 is about 8254.4969562051. The cubic root of 68136720 is about 408.4388779878.

It can be divided in two parts, 681 and 36720, that added together give a triangular number (37401 = T₂₇₃).

The spelling of 68136720 in words is "sixty-eight million, one hundred thirty-six thousand, seven hundred twenty".