75669021 has 12 divisors (see below), whose sum is σ = 110427772. Its totient is φ = 49925376.

The previous prime is 75668993. The next prime is 75669037. The reversal of 75669021 is 12096657.

75669021 is a `hidden beast` number, since 7 + 566 + 90 + 2 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 41024025 + 34644996 = 6405^2 + 5886^2 .

It is not a de Polignac number, because 75669021 - 2¹¹ = 75666973 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 (75669071) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42466 + ... + 44211.

Almost surely, 2^75669021 is an apocalyptic number.

It is an amenable number.

75669021 is a deficient number, since it is larger than the sum of its proper divisors (34758751).

75669021 is a wasteful number, since it uses less digits than its factorization.

75669021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86780 (or 86777 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 75669021 is about 8698.7942267880. The cubic root of 75669021 is about 422.9665651020.

The spelling of 75669021 in words is "seventy-five million, six hundred sixty-nine thousand, twenty-one".