68219904 has 88 divisors (see below), whose sum is σ = 185703840. Its totient is φ = 22257664.

The previous prime is 68219891. The next prime is 68219911. The reversal of 68219904 is 40991286.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 162607 + ... + 163025.

Almost surely, 2^68219904 is an apocalyptic number.

68219904 is a gapful number since it is divisible by the number (64) 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 68219904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92851920).

68219904 is an abundant number, since it is smaller than the sum of its proper divisors (117483936).

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

68219904 is a wasteful number, since it uses less digits than its factorization.

68219904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 495 (or 477 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 68219904 is about 8259.5341272980. The cubic root of 68219904 is about 408.6050231674.

The spelling of 68219904 in words is "sixty-eight million, two hundred nineteen thousand, nine hundred four".