63721903 has 12 divisors (see below), whose sum is σ = 76683240. Its totient is φ = 52734192.

The previous prime is 63721901. The next prime is 63721927. The reversal of 63721903 is 30912736.

It is not a de Polignac number, because 63721903 - 2¹ = 63721901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63721901) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21001 + ... + 23842.

It is an arithmetic number, because the mean of its divisors is an integer number (6390270).

Almost surely, 2^63721903 is an apocalyptic number.

63721903 is a deficient number, since it is larger than the sum of its proper divisors (12961337).

63721903 is a wasteful number, since it uses less digits than its factorization.

63721903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44886 (or 44879 counting only the distinct ones).

The product of its (nonzero) digits is 6804, while the sum is 31.

The square root of 63721903 is about 7982.6000150327. The cubic root of 63721903 is about 399.4197900480.

The spelling of 63721903 in words is "sixty-three million, seven hundred twenty-one thousand, nine hundred three".