63721005 has 16 divisors (see below), whose sum is σ = 103246080. Its totient is φ = 33553728.

The previous prime is 63720997. The next prime is 63721019. The reversal of 63721005 is 50012736.

It is not a de Polignac number, because 63721005 - 2³ = 63720997 is a prime.

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, 25702 + ... + 28071.

It is an arithmetic number, because the mean of its divisors is an integer number (6452880).

Almost surely, 2^63721005 is an apocalyptic number.

It is an amenable number.

63721005 is a deficient number, since it is larger than the sum of its proper divisors (39525075).

63721005 is a wasteful number, since it uses less digits than its factorization.

63721005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53860.

The product of its (nonzero) digits is 1260, while the sum is 24.

The square root of 63721005 is about 7982.5437674967. The cubic root of 63721005 is about 399.4179137666.

The spelling of 63721005 in words is "sixty-three million, seven hundred twenty-one thousand, five".