63736720 has 20 divisors (see below), whose sum is σ = 148188060. Its totient is φ = 25494656.

The previous prime is 63736691. The next prime is 63736721. The reversal of 63736720 is 2763736.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 11723776 + 52012944 = 3424^2 + 7212^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (63736721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 398275 + ... + 398434.

It is an arithmetic number, because the mean of its divisors is an integer number (7409403).

Almost surely, 2^63736720 is an apocalyptic number.

It is an amenable number.

63736720 is an abundant number, since it is smaller than the sum of its proper divisors (84451340).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

63736720 is a wasteful number, since it uses less digits than its factorization.

63736720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 796722 (or 796716 counting only the distinct ones).

The product of its (nonzero) digits is 31752, while the sum is 34.

The square root of 63736720 is about 7983.5280421628. The cubic root of 63736720 is about 399.4507461457.

The spelling of 63736720 in words is "sixty-three million, seven hundred thirty-six thousand, seven hundred twenty".