68156990 has 32 divisors (see below), whose sum is σ = 140883840. Its totient is φ = 23479200.

The previous prime is 68156951. The next prime is 68156999. The reversal of 68156990 is 9965186.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68156999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14216 + ... + 18395.

It is an arithmetic number, because the mean of its divisors is an integer number (4402620).

Almost surely, 2^68156990 is an apocalyptic number.

68156990 is an abundant number, since it is smaller than the sum of its proper divisors (72726850).

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

68156990 is a wasteful number, since it uses less digits than its factorization.

68156990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32648.

The product of its (nonzero) digits is 116640, while the sum is 44.

The square root of 68156990 is about 8255.7246804869. The cubic root of 68156990 is about 408.4793761470.

The spelling of 68156990 in words is "sixty-eight million, one hundred fifty-six thousand, nine hundred ninety".