675604021 has 4 divisors (see below), whose sum is σ = 715345452. Its totient is φ = 635862592.

The previous prime is 675604019. The next prime is 675604037. The reversal of 675604021 is 120406576.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 213568996 + 462035025 = 14614^2 + 21495^2 .

It is a cyclic number.

It is not a de Polignac number, because 675604021 - 2¹ = 675604019 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 (675602021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19870690 + ... + 19870723.

It is an arithmetic number, because the mean of its divisors is an integer number (178836363).

Almost surely, 2^675604021 is an apocalyptic number.

It is an amenable number.

675604021 is a deficient number, since it is larger than the sum of its proper divisors (39741431).

675604021 is a wasteful number, since it uses less digits than its factorization.

675604021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39741430.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 675604021 is about 25992.3839037515. The cubic root of 675604021 is about 877.4668979918.

The spelling of 675604021 in words is "six hundred seventy-five million, six hundred four thousand, twenty-one".