6638445460 has 24 divisors (see below), whose sum is σ = 13942796616. Its totient is φ = 2654985600.

The previous prime is 6638445427. The next prime is 6638445503. The reversal of 6638445460 is 645448366.

It can be written as a sum of positive squares in 4 ways, for example, as 4889365776 + 1749079684 = 69924^2 + 41822^2 .

It is a super-2 number, since 2×6638445460² = 88137916250789223200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6638445460.

It is a congruent number.

It is an unprimeable number.

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, 141534 + ... + 182506.

It is an arithmetic number, because the mean of its divisors is an integer number (580949859).

Almost surely, 2^6638445460 is an apocalyptic number.

It is an amenable number.

6638445460 is an abundant number, since it is smaller than the sum of its proper divisors (7304351156).

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

6638445460 is a wasteful number, since it uses less digits than its factorization.

6638445460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49083 (or 49081 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 46.

The square root of 6638445460 is about 81476.6559205764. The cubic root of 6638445460 is about 1879.4125843217.

The spelling of 6638445460 in words is "six billion, six hundred thirty-eight million, four hundred forty-five thousand, four hundred sixty".