76563621 has 6 divisors (see below), whose sum is σ = 110591910. Its totient is φ = 51042408.

The previous prime is 76563577. The next prime is 76563623. The reversal of 76563621 is 12636567.

76563621 is a `hidden beast` number, since 76 + 563 + 6 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 45360225 + 31203396 = 6735^2 + 5586^2 .

It is not a de Polignac number, because 76563621 - 2¹⁰ = 76562597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (76563623) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4253526 + ... + 4253543.

It is an arithmetic number, because the mean of its divisors is an integer number (18431985).

Almost surely, 2^76563621 is an apocalyptic number.

It is an amenable number.

76563621 is a deficient number, since it is larger than the sum of its proper divisors (34028289).

76563621 is a wasteful number, since it uses less digits than its factorization.

76563621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8507075 (or 8507072 counting only the distinct ones).

The product of its digits is 45360, while the sum is 36.

The square root of 76563621 is about 8750.0640569084. The cubic root of 76563621 is about 424.6268854505.

The spelling of 76563621 in words is "seventy-six million, five hundred sixty-three thousand, six hundred twenty-one".