638068450 has 24 divisors (see below), whose sum is σ = 1249272720. Its totient is φ = 241794000.

The previous prime is 638068397. The next prime is 638068471. The reversal of 638068450 is 54860836.

It is a super-3 number, since 3×638068450³ (a number of 27 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 334876 + ... + 336775.

It is an arithmetic number, because the mean of its divisors is an integer number (52053030).

Almost surely, 2^638068450 is an apocalyptic number.

638068450 is a deficient number, since it is larger than the sum of its proper divisors (611204270).

638068450 is a wasteful number, since it uses less digits than its factorization.

638068450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 671682 (or 671677 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 40.

The square root of 638068450 is about 25260.0168250142. The cubic root of 638068450 is about 860.9060443897.

The spelling of 638068450 in words is "six hundred thirty-eight million, sixty-eight thousand, four hundred fifty".