68490913920 has 768 divisors, whose sum is σ = 266640076800. Its totient is φ = 14808268800.

The previous prime is 68490913891. The next prime is 68490913921. The reversal of 68490913920 is 2931909486.

It is not an unprimeable number, because it can be changed into a prime (68490913921) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 110647371 + ... + 110647989.

It is an arithmetic number, because the mean of its divisors is an integer number (347187600).

Almost surely, 2^68490913920 is an apocalyptic number.

68490913920 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 68490913920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (133320038400).

68490913920 is an abundant number, since it is smaller than the sum of its proper divisors (198149162880).

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

68490913920 is a wasteful number, since it uses less digits than its factorization.

68490913920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 709 (or 684 counting only the distinct ones).

The product of its (nonzero) digits is 839808, while the sum is 51.

The spelling of 68490913920 in words is "sixty-eight billion, four hundred ninety million, nine hundred thirteen thousand, nine hundred twenty".