68166690 has 16 divisors (see below), whose sum is σ = 163600128. Its totient is φ = 18177776.

The previous prime is 68166689. The next prime is 68166697. The reversal of 68166690 is 9666186.

It is a super-2 number, since 2×68166690² = 9293395251112200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (68166697) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1136082 + ... + 1136141.

It is an arithmetic number, because the mean of its divisors is an integer number (10225008).

Almost surely, 2^68166690 is an apocalyptic number.

68166690 is an abundant number, since it is smaller than the sum of its proper divisors (95433438).

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

68166690 is a wasteful number, since it uses less digits than its factorization.

68166690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2272233.

The product of its (nonzero) digits is 93312, while the sum is 42.

The square root of 68166690 is about 8256.3121307276. The cubic root of 68166690 is about 408.4987532840.

The spelling of 68166690 in words is "sixty-eight million, one hundred sixty-six thousand, six hundred ninety".