638269500 has 192 divisors, whose sum is σ = 2053029888. Its totient is φ = 152800000.

The previous prime is 638269469. The next prime is 638269517. The reversal of 638269500 is 5962836.

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 63 ways as a sum of consecutive naturals, for example, 1666309 + ... + 1666691.

It is an arithmetic number, because the mean of its divisors is an integer number (10692864).

Almost surely, 2^638269500 is an apocalyptic number.

638269500 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 638269500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1026514944).

638269500 is an abundant number, since it is smaller than the sum of its proper divisors (1414760388).

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

638269500 is a wasteful number, since it uses less digits than its factorization.

638269500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 517 (or 505 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 39.

The square root of 638269500 is about 25263.9961209623. The cubic root of 638269500 is about 860.9964563114.

The spelling of 638269500 in words is "six hundred thirty-eight million, two hundred sixty-nine thousand, five hundred".