63720738 has 12 divisors (see below), whose sum is σ = 138061638. Its totient is φ = 21240240.

The previous prime is 63720731. The next prime is 63720757. The reversal of 63720738 is 83702736.

It can be written as a sum of positive squares in only one way, i.e., 63632529 + 88209 = 7977^2 + 297^2 .

It is not an unprimeable number, because it can be changed into a prime (63720731) 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, 1770003 + ... + 1770038.

Almost surely, 2^63720738 is an apocalyptic number.

63720738 is an abundant number, since it is smaller than the sum of its proper divisors (74340900).

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

63720738 is a wasteful number, since it uses less digits than its factorization.

63720738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3540049 (or 3540046 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 36.

The square root of 63720738 is about 7982.5270434869. The cubic root of 63720738 is about 399.4173558933.

It can be divided in two parts, 63 and 720738, that added together give a square (720801 = 849²).

The spelling of 63720738 in words is "sixty-three million, seven hundred twenty thousand, seven hundred thirty-eight".