68909220 has 144 divisors (see below), whose sum is σ = 221981760. Its totient is φ = 17273088.

The previous prime is 68909201. The next prime is 68909231. The reversal of 68909220 is 2290986.

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

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 224307 + ... + 224613.

It is an arithmetic number, because the mean of its divisors is an integer number (1541540).

Almost surely, 2^68909220 is an apocalyptic number.

68909220 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 68909220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110990880).

68909220 is an abundant number, since it is smaller than the sum of its proper divisors (153072540).

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

68909220 is a wasteful number, since it uses less digits than its factorization.

68909220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394 (or 389 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 68909220 is about 8301.1577505791. The cubic root of 68909220 is about 409.9766395574.

It can be divided in two parts, 6890 and 9220, that added together give a triangular number (16110 = T₁₇₉).

The spelling of 68909220 in words is "sixty-eight million, nine hundred nine thousand, two hundred twenty".