42668647 has 8 divisors (see below), whose sum is σ = 49312800. Its totient is φ = 36161664.

The previous prime is 42668629. The next prime is 42668693. The reversal of 42668647 is 74686624.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-42668647 is a prime.

It is a super-2 number, since 2×42668647² = 3641226873621218, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42668627) 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, 33622 + ... + 34867.

It is an arithmetic number, because the mean of its divisors is an integer number (6164100).

Almost surely, 2^42668647 is an apocalyptic number.

42668647 is a deficient number, since it is larger than the sum of its proper divisors (6644153).

42668647 is an equidigital number, since it uses as much as digits as its factorization.

42668647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68585.

The product of its digits is 387072, while the sum is 43.

The square root of 42668647 is about 6532.1242333563. The cubic root of 42668647 is about 349.4375920000.

The spelling of 42668647 in words is "forty-two million, six hundred sixty-eight thousand, six hundred forty-seven".