68136828 has 12 divisors (see below), whose sum is σ = 158985960. Its totient is φ = 22712272.

The previous prime is 68136823. The next prime is 68136829. The reversal of 68136828 is 82863186.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 68136828.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68136823) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2839023 + ... + 2839046.

It is an arithmetic number, because the mean of its divisors is an integer number (13248830).

Almost surely, 2^68136828 is an apocalyptic number.

It is an amenable number.

68136828 is an abundant number, since it is smaller than the sum of its proper divisors (90849132).

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

68136828 is a wasteful number, since it uses less digits than its factorization.

68136828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5678076 (or 5678074 counting only the distinct ones).

The product of its digits is 110592, while the sum is 42.

The square root of 68136828 is about 8254.5034980912. The cubic root of 68136828 is about 408.4390937861.

The spelling of 68136828 in words is "sixty-eight million, one hundred thirty-six thousand, eight hundred twenty-eight".