638469006 has 32 divisors (see below), whose sum is σ = 1522810368. Its totient is φ = 174488160.

The previous prime is 638468977. The next prime is 638469011. The reversal of 638469006 is 600964836.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 329505 + ... + 331436.

It is an arithmetic number, because the mean of its divisors is an integer number (47587824).

Almost surely, 2^638469006 is an apocalyptic number.

638469006 is an abundant number, since it is smaller than the sum of its proper divisors (884341362).

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

638469006 is a wasteful number, since it uses less digits than its factorization.

638469006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660976.

The product of its (nonzero) digits is 186624, while the sum is 42.

The square root of 638469006 is about 25267.9442377096. The cubic root of 638469006 is about 861.0861551323.

The spelling of 638469006 in words is "six hundred thirty-eight million, four hundred sixty-nine thousand, six".