68904940 has 96 divisors (see below), whose sum is σ = 164376576. Its totient is φ = 24088320.

The previous prime is 68904931. The next prime is 68904943. The reversal of 68904940 is 4940986.

It is a junction number, because it is equal to n+sod(n) for n = 68904893 and 68904902.

It is not an unprimeable number, because it can be changed into a prime (68904943) 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, 668929 + ... + 669031.

It is an arithmetic number, because the mean of its divisors is an integer number (1712256).

Almost surely, 2^68904940 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 68904940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82188288).

68904940 is an abundant number, since it is smaller than the sum of its proper divisors (95471636).

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

68904940 is a wasteful number, since it uses less digits than its factorization.

68904940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239 (or 237 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 68904940 is about 8300.8999512101. The cubic root of 68904940 is about 409.9681514027.

The spelling of 68904940 in words is "sixty-eight million, nine hundred four thousand, nine hundred forty".