68449890 has 16 divisors (see below), whose sum is σ = 164279808. Its totient is φ = 18253296.

The previous prime is 68449883. The next prime is 68449897. The reversal of 68449890 is 9894486.

It is an interprime number because it is at equal distance from previous prime (68449883) and next prime (68449897).

It is not an unprimeable number, because it can be changed into a prime (68449897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1140802 + ... + 1140861.

It is an arithmetic number, because the mean of its divisors is an integer number (10267488).

Almost surely, 2^68449890 is an apocalyptic number.

68449890 is an abundant number, since it is smaller than the sum of its proper divisors (95829918).

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

68449890 is a wasteful number, since it uses less digits than its factorization.

68449890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2281673.

The product of its (nonzero) digits is 497664, while the sum is 48.

The square root of 68449890 is about 8273.4448689769. Note that the first 3 decimals coincide. The cubic root of 68449890 is about 409.0636773343.

The spelling of 68449890 in words is "sixty-eight million, four hundred forty-nine thousand, eight hundred ninety".