75636821 has 8 divisors (see below), whose sum is σ = 82437600. Its totient is φ = 68976432.

The previous prime is 75636793. The next prime is 75636839. The reversal of 75636821 is 12863657.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-75636821 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75636851) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33971 + ... + 36128.

It is an arithmetic number, because the mean of its divisors is an integer number (10304700).

Almost surely, 2^75636821 is an apocalyptic number.

It is an amenable number.

75636821 is a deficient number, since it is larger than the sum of its proper divisors (6800779).

75636821 is a wasteful number, since it uses less digits than its factorization.

75636821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70195.

The product of its digits is 60480, while the sum is 38.

The square root of 75636821 is about 8696.9431986187. The cubic root of 75636821 is about 422.9065605562.

The spelling of 75636821 in words is "seventy-five million, six hundred thirty-six thousand, eight hundred twenty-one".