42509668 has 18 divisors (see below), whose sum is σ = 75386598. Its totient is φ = 20972160.

The previous prime is 42509653. The next prime is 42509717. The reversal of 42509668 is 86690524.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 35497764 + 7011904 = 5958^2 + 2648^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 42509668.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 128263 + ... + 128593.

Almost surely, 2^42509668 is an apocalyptic number.

It is an amenable number.

42509668 is a deficient number, since it is larger than the sum of its proper divisors (32876930).

42509668 is an equidigital number, since it uses as much as digits as its factorization.

42509668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 763 (or 430 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 42509668 is about 6519.9438647890. The cubic root of 42509668 is about 349.0030623454.

The spelling of 42509668 in words is "forty-two million, five hundred nine thousand, six hundred sixty-eight".