68637680 has 40 divisors (see below), whose sum is σ = 161520912. Its totient is φ = 27121664.

The previous prime is 68637677. The next prime is 68637683. The reversal of 68637680 is 8673686.

It is an interprime number because it is at equal distance from previous prime (68637677) and next prime (68637683).

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×68637680² = 9422262231564800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68637683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1472 + ... + 11808.

Almost surely, 2^68637680 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 68637680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80760456).

68637680 is an abundant number, since it is smaller than the sum of its proper divisors (92883232).

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

68637680 is a wasteful number, since it uses less digits than its factorization.

68637680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10433 (or 10427 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 44.

The square root of 68637680 is about 8284.7860563807. The cubic root of 68637680 is about 409.4374199635.

The spelling of 68637680 in words is "sixty-eight million, six hundred thirty-seven thousand, six hundred eighty".