6638403072 has 80 divisors (see below), whose sum is σ = 20211599232. Its totient is φ = 1896683520.

The previous prime is 6638403061. The next prime is 6638403073. The reversal of 6638403072 is 2703048366.

It is a self number, because there is not a number n which added to its sum of digits gives 6638403072.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6638403073) 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, 297954 + ... + 319457.

Almost surely, 2^6638403072 is an apocalyptic number.

It is an amenable number.

6638403072 is an abundant number, since it is smaller than the sum of its proper divisors (13573196160).

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

6638403072 is an equidigital number, since it uses as much as digits as its factorization.

6638403072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 617439 (or 617423 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 39.

The square root of 6638403072 is about 81476.3957965741. The cubic root of 6638403072 is about 1879.4085841528.

The spelling of 6638403072 in words is "six billion, six hundred thirty-eight million, four hundred three thousand, seventy-two".