638005369480 has 64 divisors (see below), whose sum is σ = 1462900221360. Its totient is φ = 250335141888.

The previous prime is 638005369381. The next prime is 638005369483. The reversal of 638005369480 is 84963500836.

It can be written as a sum of positive squares in 8 ways, for example, as 438559168644 + 199446200836 = 662238^2 + 446594^2 .

It is a super-2 number, since 2×638005369480² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (638005369483) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11150224 + ... + 11207296.

Almost surely, 2^638005369480 is an apocalyptic number.

It is an amenable number.

638005369480 is an abundant number, since it is smaller than the sum of its proper divisors (824894851880).

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

638005369480 is a wasteful number, since it uses less digits than its factorization.

638005369480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62410 (or 62406 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 52.

The spelling of 638005369480 in words is "six hundred thirty-eight billion, five million, three hundred sixty-nine thousand, four hundred eighty".