63721406 has 16 divisors (see below), whose sum is σ = 115662816. Its totient is φ = 25702656.

The previous prime is 63721403. The next prime is 63721409. The reversal of 63721406 is 60412736.

It is an interprime number because it is at equal distance from previous prime (63721403) and next prime (63721409).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63721403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 133631 + ... + 134106.

It is an arithmetic number, because the mean of its divisors is an integer number (7228926).

Almost surely, 2^63721406 is an apocalyptic number.

63721406 is a deficient number, since it is larger than the sum of its proper divisors (51941410).

63721406 is a wasteful number, since it uses less digits than its factorization.

63721406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267763.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 63721406 is about 7982.5688847639. The cubic root of 63721406 is about 399.4187516182.

The spelling of 63721406 in words is "sixty-three million, seven hundred twenty-one thousand, four hundred six".