63215728 has 20 divisors (see below), whose sum is σ = 122612688. Its totient is φ = 31573760.

The previous prime is 63215723. The next prime is 63215729. The reversal of 63215728 is 82751236.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 63215693 and 63215702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63215723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20325 + ... + 23227.

Almost surely, 2^63215728 is an apocalyptic number.

It is an amenable number.

63215728 is a deficient number, since it is larger than the sum of its proper divisors (59396960).

63215728 is a wasteful number, since it uses less digits than its factorization.

63215728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4272 (or 4266 counting only the distinct ones).

The product of its digits is 20160, while the sum is 34.

The square root of 63215728 is about 7950.8319061593. The cubic root of 63215728 is about 398.3593801159.

The spelling of 63215728 in words is "sixty-three million, two hundred fifteen thousand, seven hundred twenty-eight".