76563221 has 8 divisors (see below), whose sum is σ = 87554304. Its totient is φ = 65585520.

The previous prime is 76563209. The next prime is 76563233. The reversal of 76563221 is 12236567.

It is an interprime number because it is at equal distance from previous prime (76563209) and next prime (76563233).

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

It is a de Polignac number, because none of the positive numbers 2^k-76563221 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 (76563281) 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, 18116 + ... + 21938.

It is an arithmetic number, because the mean of its divisors is an integer number (10944288).

Almost surely, 2^76563221 is an apocalyptic number.

It is an amenable number.

76563221 is a deficient number, since it is larger than the sum of its proper divisors (10991083).

76563221 is a wasteful number, since it uses less digits than its factorization.

76563221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6691.

The product of its digits is 15120, while the sum is 32.

The square root of 76563221 is about 8750.0411999030. The cubic root of 76563221 is about 424.6261459738.

Adding to 76563221 its reverse (12236567), we get a palindrome (88799788).

The spelling of 76563221 in words is "seventy-six million, five hundred sixty-three thousand, two hundred twenty-one".