42678661 has 16 divisors (see below), whose sum is σ = 45669888. Its totient is φ = 39816000.

The previous prime is 42678659. The next prime is 42678677. The reversal of 42678661 is 16687624.

It is a cyclic number.

It is not a de Polignac number, because 42678661 - 2¹ = 42678659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42678641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 134475 + ... + 134791.

It is an arithmetic number, because the mean of its divisors is an integer number (2854368).

Almost surely, 2^42678661 is an apocalyptic number.

It is an amenable number.

42678661 is a deficient number, since it is larger than the sum of its proper divisors (2991227).

42678661 is a wasteful number, since it uses less digits than its factorization.

42678661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492.

The product of its digits is 96768, while the sum is 40.

The square root of 42678661 is about 6532.8907077954. The cubic root of 42678661 is about 349.4649266245.

The spelling of 42678661 in words is "forty-two million, six hundred seventy-eight thousand, six hundred sixty-one".