63729988 has 18 divisors (see below), whose sum is σ = 129736446. Its totient is φ = 27312768.

The previous prime is 63729983. The next prime is 63729989. The reversal of 63729988 is 88992736.

It can be written as a sum of positive squares in only one way, i.e., 59721984 + 4008004 = 7728^2 + 2002^2 .

It is a super-2 number, since 2×63729988² = 8123022740960288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (63729983) 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, 162381 + ... + 162772.

Almost surely, 2^63729988 is an apocalyptic number.

It is an amenable number.

63729988 is an abundant number, since it is smaller than the sum of its proper divisors (66006458).

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

63729988 is a wasteful number, since it uses less digits than its factorization.

63729988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325171 (or 325162 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 52.

The square root of 63729988 is about 7983.1064129197. The cubic root of 63729988 is about 399.4366820546.

It can be divided in two parts, 637 and 29988, that added together give a square (30625 = 175²).

The spelling of 63729988 in words is "sixty-three million, seven hundred twenty-nine thousand, nine hundred eighty-eight".