68455990 has 16 divisors (see below), whose sum is σ = 123405120. Its totient is φ = 27341440.

The previous prime is 68455987. The next prime is 68455997. The reversal of 68455990 is 9955486.

It is a self number, because there is not a number n which added to its sum of digits gives 68455990.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68455997) 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, 2430 + ... + 11950.

It is an arithmetic number, because the mean of its divisors is an integer number (7712820).

Almost surely, 2^68455990 is an apocalyptic number.

68455990 is a deficient number, since it is larger than the sum of its proper divisors (54949130).

68455990 is a wasteful number, since it uses less digits than its factorization.

68455990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10247.

The product of its (nonzero) digits is 388800, while the sum is 46.

The square root of 68455990 is about 8273.8135101052. The cubic root of 68455990 is about 409.0758283853.

The spelling of 68455990 in words is "sixty-eight million, four hundred fifty-five thousand, nine hundred ninety".