42688809 has 32 divisors (see below), whose sum is σ = 65640960. Its totient is φ = 27400464.

The previous prime is 42688777. The next prime is 42688813. The reversal of 42688809 is 90888624.

It is a happy number.

It is not a de Polignac number, because 42688809 - 2⁵ = 42688777 is a prime.

It is a super-3 number, since 3×42688809³ (a number of 24 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (42688859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 96142 + ... + 96584.

It is an arithmetic number, because the mean of its divisors is an integer number (2051280).

Almost surely, 2^42688809 is an apocalyptic number.

It is an amenable number.

42688809 is a deficient number, since it is larger than the sum of its proper divisors (22952151).

42688809 is a wasteful number, since it uses less digits than its factorization.

42688809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 578 (or 572 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 45.

The square root of 42688809 is about 6533.6673469040. The cubic root of 42688809 is about 349.4926226592.

The spelling of 42688809 in words is "forty-two million, six hundred eighty-eight thousand, eight hundred nine".