75668921 has 8 divisors (see below), whose sum is σ = 80414280. Its totient is φ = 70956288.

The previous prime is 75668911. The next prime is 75668933. The reversal of 75668921 is 12986657.

It can be written as a sum of positive squares in 4 ways, for example, as 4080400 + 71588521 = 2020^2 + 8461^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 75668921 - 2²² = 71474617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (75668911) 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 7 ways as a sum of consecutive naturals, for example, 3326 + ... + 12743.

It is an arithmetic number, because the mean of its divisors is an integer number (10051785).

Almost surely, 2^75668921 is an apocalyptic number.

It is an amenable number.

75668921 is a deficient number, since it is larger than the sum of its proper divisors (4745359).

75668921 is a wasteful number, since it uses less digits than its factorization.

75668921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16363.

The product of its digits is 181440, while the sum is 44.

The square root of 75668921 is about 8698.7884788630. The cubic root of 75668921 is about 422.9663787789.

The spelling of 75668921 in words is "seventy-five million, six hundred sixty-eight thousand, nine hundred twenty-one".