68631816 has 128 divisors (see below), whose sum is σ = 199065600. Its totient is φ = 19514880.

The previous prime is 68631811. The next prime is 68631847. The reversal of 68631816 is 61813686.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (68631811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 540345 + ... + 540471.

It is an arithmetic number, because the mean of its divisors is an integer number (1555200).

Almost surely, 2^68631816 is an apocalyptic number.

68631816 is a gapful number since it is divisible by the number (66) 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 68631816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99532800).

68631816 is an abundant number, since it is smaller than the sum of its proper divisors (130433784).

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

68631816 is a wasteful number, since it uses less digits than its factorization.

68631816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259 (or 255 counting only the distinct ones).

The product of its digits is 41472, while the sum is 39.

The square root of 68631816 is about 8284.4321471058. The cubic root of 68631816 is about 409.4257596558.

The spelling of 68631816 in words is "sixty-eight million, six hundred thirty-one thousand, eight hundred sixteen".