42688066 has 4 divisors (see below), whose sum is σ = 64032102. Its totient is φ = 21344032.

The previous prime is 42688057. The next prime is 42688109. The reversal of 42688066 is 66088624.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 35153041 + 7535025 = 5929^2 + 2745^2 .

It is a super-3 number, since 3×42688066³ (a number of 24 digits) contains 333 as substring.

It is a plaindrome in base 12.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10672015 + ... + 10672018.

Almost surely, 2^42688066 is an apocalyptic number.

42688066 is a deficient number, since it is larger than the sum of its proper divisors (21344036).

42688066 is a wasteful number, since it uses less digits than its factorization.

42688066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21344035.

The product of its (nonzero) digits is 110592, while the sum is 40.

The square root of 42688066 is about 6533.6104873186. The cubic root of 42688066 is about 349.4905950043.

The spelling of 42688066 in words is "forty-two million, six hundred eighty-eight thousand, sixty-six".