68449390 has 16 divisors (see below), whose sum is σ = 125831232. Its totient is φ = 26797024.

The previous prime is 68449387. The next prime is 68449393. The reversal of 68449390 is 9394486.

It is an interprime number because it is at equal distance from previous prime (68449387) and next prime (68449393).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68449393) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72349 + ... + 73288.

It is an arithmetic number, because the mean of its divisors is an integer number (7864452).

Almost surely, 2^68449390 is an apocalyptic number.

68449390 is a deficient number, since it is larger than the sum of its proper divisors (57381842).

68449390 is a wasteful number, since it uses less digits than its factorization.

68449390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145691.

The product of its (nonzero) digits is 186624, while the sum is 43.

The square root of 68449390 is about 8273.4146517626. The cubic root of 68449390 is about 409.0626813145.

The spelling of 68449390 in words is "sixty-eight million, four hundred forty-nine thousand, three hundred ninety".