638087804 has 24 divisors (see below), whose sum is σ = 1166161920. Its totient is φ = 304921584.

The previous prime is 638087803. The next prime is 638087869. The reversal of 638087804 is 408780836.

It is a happy number.

638087804 is nontrivially palindromic in base 11.

It is a super-2 number, since 2×638087804² = 814312091227084832, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638087803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 159857 + ... + 163799.

It is an arithmetic number, because the mean of its divisors is an integer number (48590080).

Almost surely, 2^638087804 is an apocalyptic number.

It is an amenable number.

638087804 is a deficient number, since it is larger than the sum of its proper divisors (528074116).

638087804 is a wasteful number, since it uses less digits than its factorization.

638087804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5729 (or 5727 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 44.

The square root of 638087804 is about 25260.3999176577. The cubic root of 638087804 is about 860.9147486842.

The spelling of 638087804 in words is "six hundred thirty-eight million, eighty-seven thousand, eight hundred four".