68400290 has 16 divisors (see below), whose sum is σ = 140709312. Its totient is φ = 23451504.

The previous prime is 68400289. The next prime is 68400301. The reversal of 68400290 is 9200486.

It is an unprimeable number.

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, 488504 + ... + 488643.

It is an arithmetic number, because the mean of its divisors is an integer number (8794332).

Almost surely, 2^68400290 is an apocalyptic number.

68400290 is an abundant number, since it is smaller than the sum of its proper divisors (72309022).

68400290 is a wasteful number, since it uses less digits than its factorization.

68400290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 977161.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 68400290 is about 8270.4467835783. The cubic root of 68400290 is about 408.9648485362.

The spelling of 68400290 in words is "sixty-eight million, four hundred thousand, two hundred ninety".