42647661 has 64 divisors (see below), whose sum is σ = 77414400. Its totient is φ = 22680000.

The previous prime is 42647639. The next prime is 42647677. The reversal of 42647661 is 16674624.

42647661 is a `hidden beast` number, since 4 + 2 + 647 + 6 + 6 + 1 = 666.

It is not a de Polignac number, because 42647661 - 2⁵ = 42647629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42647161) 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 63 ways as a sum of consecutive naturals, for example, 169786 + ... + 170036.

It is an arithmetic number, because the mean of its divisors is an integer number (1209600).

Almost surely, 2^42647661 is an apocalyptic number.

It is an amenable number.

42647661 is a deficient number, since it is larger than the sum of its proper divisors (34766739).

42647661 is a wasteful number, since it uses less digits than its factorization.

42647661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327 (or 321 counting only the distinct ones).

The product of its digits is 48384, while the sum is 36.

The square root of 42647661 is about 6530.5176670766. The cubic root of 42647661 is about 349.3802938790.

The spelling of 42647661 in words is "forty-two million, six hundred forty-seven thousand, six hundred sixty-one".