68645220 has 96 divisors (see below), whose sum is σ = 221453568. Its totient is φ = 15562752.

The previous prime is 68645207. The next prime is 68645221. The reversal of 68645220 is 2254686.

It is not an unprimeable number, because it can be changed into a prime (68645221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 56944 + ... + 58136.

It is an arithmetic number, because the mean of its divisors is an integer number (2306808).

Almost surely, 2^68645220 is an apocalyptic number.

68645220 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 68645220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110726784).

68645220 is an abundant number, since it is smaller than the sum of its proper divisors (152808348).

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

68645220 is a wasteful number, since it uses less digits than its factorization.

68645220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1349 (or 1347 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 33.

The square root of 68645220 is about 8285.2410948626. The cubic root of 68645220 is about 409.4524119481.

The spelling of 68645220 in words is "sixty-eight million, six hundred forty-five thousand, two hundred twenty".