63729307644 has 48 divisors (see below), whose sum is σ = 151356850176. Its totient is φ = 20867112000.

The previous prime is 63729307613. The next prime is 63729307679. The reversal of 63729307644 is 44670392736.

It is a super-2 number, since 2×63729307644² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53092 + ... + 360939.

It is an arithmetic number, because the mean of its divisors is an integer number (3153267712).

Almost surely, 2^63729307644 is an apocalyptic number.

It is an amenable number.

63729307644 is an abundant number, since it is smaller than the sum of its proper divisors (87627542532).

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

63729307644 is a wasteful number, since it uses less digits than its factorization.

63729307644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414266 (or 414264 counting only the distinct ones).

The product of its (nonzero) digits is 4572288, while the sum is 51.

The spelling of 63729307644 in words is "sixty-three billion, seven hundred twenty-nine million, three hundred seven thousand, six hundred forty-four".