68197140 has 240 divisors, whose sum is σ = 241496640. Its totient is φ = 15966720.

The previous prime is 68197121. The next prime is 68197147. The reversal of 68197140 is 4179186.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 68197095 and 68197104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68197147) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 766216 + ... + 766304.

It is an arithmetic number, because the mean of its divisors is an integer number (1006236).

Almost surely, 2^68197140 is an apocalyptic number.

68197140 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 68197140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120748320).

68197140 is an abundant number, since it is smaller than the sum of its proper divisors (173299500).

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

68197140 is a wasteful number, since it uses less digits than its factorization.

68197140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164 (or 153 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 68197140 is about 8258.1559684956. The cubic root of 68197140 is about 408.5595695731.

The spelling of 68197140 in words is "sixty-eight million, one hundred ninety-seven thousand, one hundred forty".