42728661 has 16 divisors (see below), whose sum is σ = 63403200. Its totient is φ = 28440144.

The previous prime is 42728617. The next prime is 42728669. The reversal of 42728661 is 16682724.

It is not a de Polignac number, because 42728661 - 2⁷ = 42728533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42728669) 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, 29230 + ... + 30656.

It is an arithmetic number, because the mean of its divisors is an integer number (3962700).

Almost surely, 2^42728661 is an apocalyptic number.

It is an amenable number.

42728661 is a deficient number, since it is larger than the sum of its proper divisors (20674539).

42728661 is a wasteful number, since it uses less digits than its factorization.

42728661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2545 (or 2539 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 42728661 is about 6536.7163775094. The cubic root of 42728661 is about 349.6013447375.

The spelling of 42728661 in words is "forty-two million, seven hundred twenty-eight thousand, six hundred sixty-one".