68609890 has 8 divisors (see below), whose sum is σ = 123497820. Its totient is φ = 27443952.

The previous prime is 68609869. The next prime is 68609899. The reversal of 68609890 is 9890686.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 63632529 + 4977361 = 7977^2 + 2231^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 68609890.

It is not an unprimeable number, because it can be changed into a prime (68609899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3430485 + ... + 3430504.

Almost surely, 2^68609890 is an apocalyptic number.

68609890 is a deficient number, since it is larger than the sum of its proper divisors (54887930).

68609890 is a wasteful number, since it uses less digits than its factorization.

68609890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6860996.

The product of its (nonzero) digits is 186624, while the sum is 46.

The square root of 68609890 is about 8283.1087159351. The cubic root of 68609890 is about 409.3821548776.

The spelling of 68609890 in words is "sixty-eight million, six hundred nine thousand, eight hundred ninety".