42688647 has 8 divisors (see below), whose sum is σ = 63242480. Its totient is φ = 28459080.

The previous prime is 42688631. The next prime is 42688663. The reversal of 42688647 is 74688624.

It is an interprime number because it is at equal distance from previous prime (42688631) and next prime (42688663).

It is not a de Polignac number, because 42688647 - 2⁴ = 42688631 is a prime.

It is a super-3 number, since 3×42688647³ (a number of 24 digits) contains 333 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 (42688627) 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 7 ways as a sum of consecutive naturals, for example, 790504 + ... + 790557.

It is an arithmetic number, because the mean of its divisors is an integer number (7905310).

Almost surely, 2^42688647 is an apocalyptic number.

42688647 is a deficient number, since it is larger than the sum of its proper divisors (20553833).

42688647 is a wasteful number, since it uses less digits than its factorization.

42688647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1581070 (or 1581064 counting only the distinct ones).

The product of its digits is 516096, while the sum is 45.

The square root of 42688647 is about 6533.6549495669. The cubic root of 42688647 is about 349.4921805615.

The spelling of 42688647 in words is "forty-two million, six hundred eighty-eight thousand, six hundred forty-seven".