68636490 has 32 divisors (see below), whose sum is σ = 177399936. Its totient is φ = 16895040.

The previous prime is 68636489. The next prime is 68636507. The reversal of 68636490 is 9463686.

It is a Curzon number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 87606 + ... + 88385.

It is an arithmetic number, because the mean of its divisors is an integer number (5543748).

Almost surely, 2^68636490 is an apocalyptic number.

68636490 is an abundant number, since it is smaller than the sum of its proper divisors (108763446).

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

68636490 is a wasteful number, since it uses less digits than its factorization.

68636490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176014.

The product of its (nonzero) digits is 186624, while the sum is 42.

The square root of 68636490 is about 8284.7142376789. The cubic root of 68636490 is about 409.4350537543.

The spelling of 68636490 in words is "sixty-eight million, six hundred thirty-six thousand, four hundred ninety".