638470484 has 6 divisors (see below), whose sum is σ = 1117323354. Its totient is φ = 319235240.

The previous prime is 638470429. The next prime is 638470517. The reversal of 638470484 is 484074836.

It can be written as a sum of positive squares in only one way, i.e., 472627600 + 165842884 = 21740^2 + 12878^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79808807 + ... + 79808814.

It is an arithmetic number, because the mean of its divisors is an integer number (186220559).

Almost surely, 2^638470484 is an apocalyptic number.

It is an amenable number.

638470484 is a deficient number, since it is larger than the sum of its proper divisors (478852870).

638470484 is a wasteful number, since it uses less digits than its factorization.

638470484 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159617625 (or 159617623 counting only the distinct ones).

The product of its (nonzero) digits is 516096, while the sum is 44.

The square root of 638470484 is about 25267.9734842349. The cubic root of 638470484 is about 861.0868195782.

The spelling of 638470484 in words is "six hundred thirty-eight million, four hundred seventy thousand, four hundred eighty-four".