66868434 has 12 divisors (see below), whose sum is σ = 144881646. Its totient is φ = 22289472.

The previous prime is 66868433. The next prime is 66868441. The reversal of 66868434 is 43486866.

It can be written as a sum of positive squares in only one way, i.e., 56927025 + 9941409 = 7545^2 + 3153^2 .

It is a super-2 number, since 2×66868434² = 8942774931224712, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66868434.

It is not an unprimeable number, because it can be changed into a prime (66868433) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1857439 + ... + 1857474.

Almost surely, 2^66868434 is an apocalyptic number.

66868434 is an abundant number, since it is smaller than the sum of its proper divisors (78013212).

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

66868434 is a wasteful number, since it uses less digits than its factorization.

66868434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3714921 (or 3714918 counting only the distinct ones).

The product of its digits is 663552, while the sum is 45.

The square root of 66868434 is about 8177.3121500894. The cubic root of 66868434 is about 405.8887842785. Note that the first 3 decimals are identical.

The spelling of 66868434 in words is "sixty-six million, eight hundred sixty-eight thousand, four hundred thirty-four".