68204697990 has 192 divisors, whose sum is σ = 194976246528. Its totient is φ = 15167243520.

The previous prime is 68204697943. The next prime is 68204697997. The reversal of 68204697990 is 9979640286.

It is a super-2 number, since 2×68204697990² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68204697997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 7687537 + ... + 7696403.

It is an arithmetic number, because the mean of its divisors is an integer number (1015501284).

Almost surely, 2^68204697990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68204697990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97488123264).

68204697990 is an abundant number, since it is smaller than the sum of its proper divisors (126771548538).

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

68204697990 is a wasteful number, since it uses less digits than its factorization.

68204697990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9075 (or 9064 counting only the distinct ones).

The product of its (nonzero) digits is 11757312, while the sum is 60.

The spelling of 68204697990 in words is "sixty-eight billion, two hundred four million, six hundred ninety-seven thousand, nine hundred ninety".