66427647 has 48 divisors (see below), whose sum is σ = 107445888. Its totient is φ = 36167040.

The previous prime is 66427643. The next prime is 66427649. The reversal of 66427647 is 74672466.

It is not a de Polignac number, because 66427647 - 2² = 66427643 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66427599 and 66427608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66427643) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 239673 + ... + 239949.

It is an arithmetic number, because the mean of its divisors is an integer number (2238456).

Almost surely, 2^66427647 is an apocalyptic number.

66427647 is a deficient number, since it is larger than the sum of its proper divisors (41018241).

66427647 is a wasteful number, since it uses less digits than its factorization.

66427647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360 (or 347 counting only the distinct ones).

The product of its digits is 338688, while the sum is 42.

The square root of 66427647 is about 8150.3157607543. The cubic root of 66427647 is about 404.9949641197.

The spelling of 66427647 in words is "sixty-six million, four hundred twenty-seven thousand, six hundred forty-seven".