638003463438 has 16 divisors (see below), whose sum is σ = 1392007556736. Its totient is φ = 193334382840.

The previous prime is 638003463389. The next prime is 638003463457. The reversal of 638003463438 is 834364300836.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4833359506 + ... + 4833359637.

It is an arithmetic number, because the mean of its divisors is an integer number (87000472296).

Almost surely, 2^638003463438 is an apocalyptic number.

638003463438 is an abundant number, since it is smaller than the sum of its proper divisors (754004093298).

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

638003463438 is a wasteful number, since it uses less digits than its factorization.

638003463438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9666719159.

The product of its (nonzero) digits is 2985984, while the sum is 48.

The spelling of 638003463438 in words is "six hundred thirty-eight billion, three million, four hundred sixty-three thousand, four hundred thirty-eight".