68490440 has 64 divisors (see below), whose sum is σ = 163339200. Its totient is φ = 25774848.

The previous prime is 68490437. The next prime is 68490491. The reversal of 68490440 is 4409486.

It is a self number, because there is not a number n which added to its sum of digits gives 68490440.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 172322 + ... + 172718.

It is an arithmetic number, because the mean of its divisors is an integer number (2552175).

Almost surely, 2^68490440 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 68490440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81669600).

68490440 is an abundant number, since it is smaller than the sum of its proper divisors (94848760).

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

68490440 is a wasteful number, since it uses less digits than its factorization.

68490440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 654 (or 650 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 68490440 is about 8275.8951177501. The cubic root of 68490440 is about 409.1444383976.

The spelling of 68490440 in words is "sixty-eight million, four hundred ninety thousand, four hundred forty".