42635256728 has 8 divisors (see below), whose sum is σ = 79941106380. Its totient is φ = 21317628360.

The previous prime is 42635256721. The next prime is 42635256737. The reversal of 42635256728 is 82765253624.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42635256721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2664703538 + ... + 2664703553.

Almost surely, 2^42635256728 is an apocalyptic number.

It is an amenable number.

42635256728 is a deficient number, since it is larger than the sum of its proper divisors (37305849652).

42635256728 is a wasteful number, since it uses less digits than its factorization.

42635256728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5329407097 (or 5329407093 counting only the distinct ones).

The product of its digits is 4838400, while the sum is 50.

The spelling of 42635256728 in words is "forty-two billion, six hundred thirty-five million, two hundred fifty-six thousand, seven hundred twenty-eight".