42728087 has 2 divisors, whose sum is σ = 42728088. Its totient is φ = 42728086.

The previous prime is 42728083. The next prime is 42728117. The reversal of 42728087 is 78082724.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42728087 - 2² = 42728083 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42728087.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42728083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21364043 + 21364044.

It is an arithmetic number, because the mean of its divisors is an integer number (21364044).

Almost surely, 2^42728087 is an apocalyptic number.

42728087 is a deficient number, since it is larger than the sum of its proper divisors (1).

42728087 is an equidigital number, since it uses as much as digits as its factorization.

42728087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 50176, while the sum is 38.

The square root of 42728087 is about 6536.6724715256. The cubic root of 42728087 is about 349.5997792616.

The spelling of 42728087 in words is "forty-two million, seven hundred twenty-eight thousand, eighty-seven".