68491220 has 72 divisors (see below), whose sum is σ = 170989056. Its totient is φ = 22967616.

The previous prime is 68491169. The next prime is 68491237. The reversal of 68491220 is 2219486.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 45317 + ... + 46803.

It is an arithmetic number, because the mean of its divisors is an integer number (2374848).

Almost surely, 2^68491220 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68491220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85494528).

68491220 is an abundant number, since it is smaller than the sum of its proper divisors (102497836).

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

68491220 is a wasteful number, since it uses less digits than its factorization.

68491220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1557 (or 1548 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 68491220 is about 8275.9422424277. The cubic root of 68491220 is about 409.1459915654.

The spelling of 68491220 in words is "sixty-eight million, four hundred ninety-one thousand, two hundred twenty".