75066021 has 10 divisors (see below), whose sum is σ = 112135782. Its totient is φ = 50043960.

The previous prime is 75065989. The next prime is 75066023. The reversal of 75066021 is 12066057.

75066021 is a `hidden beast` number, since 7 + 50 + 6 + 602 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 61449921 + 13616100 = 7839^2 + 3690^2 .

It is not a de Polignac number, because 75066021 - 2⁵ = 75065989 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75066023) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 463290 + ... + 463451.

Almost surely, 2^75066021 is an apocalyptic number.

It is an amenable number.

75066021 is a deficient number, since it is larger than the sum of its proper divisors (37069761).

75066021 is an equidigital number, since it uses as much as digits as its factorization.

75066021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 926753 (or 926744 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 75066021 is about 8664.0649235795. The cubic root of 75066021 is about 421.8400391769.

The spelling of 75066021 in words is "seventy-five million, sixty-six thousand, twenty-one".