63766721 has 8 divisors (see below), whose sum is σ = 67355904. Its totient is φ = 60273360.

The previous prime is 63766709. The next prime is 63766763. The reversal of 63766721 is 12766736.

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

It is a cyclic number.

It is not a de Polignac number, because 63766721 - 2¹⁰ = 63765697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63766771) 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, 22586 + ... + 25251.

It is an arithmetic number, because the mean of its divisors is an integer number (8419488).

Almost surely, 2^63766721 is an apocalyptic number.

It is an amenable number.

63766721 is a deficient number, since it is larger than the sum of its proper divisors (3589183).

63766721 is a wasteful number, since it uses less digits than its factorization.

63766721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47911.

The product of its digits is 63504, while the sum is 38.

The square root of 63766721 is about 7985.4067523201. The cubic root of 63766721 is about 399.5134103998.

The spelling of 63766721 in words is "sixty-three million, seven hundred sixty-six thousand, seven hundred twenty-one".