638153228 has 48 divisors (see below), whose sum is σ = 1218201600. Its totient is φ = 291392640.

The previous prime is 638153227. The next prime is 638153237. The reversal of 638153228 is 822351836.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a junction number, because it is equal to n+sod(n) for n = 638153191 and 638153200.

It is not an unprimeable number, because it can be changed into a prime (638153221) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1033976 + ... + 1034592.

It is an arithmetic number, because the mean of its divisors is an integer number (25379200).

Almost surely, 2^638153228 is an apocalyptic number.

It is an amenable number.

638153228 is a deficient number, since it is larger than the sum of its proper divisors (580048372).

638153228 is a wasteful number, since it uses less digits than its factorization.

638153228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1110 (or 1108 counting only the distinct ones).

The product of its digits is 69120, while the sum is 38.

The square root of 638153228 is about 25261.6948758392. The cubic root of 638153228 is about 860.9441712607.

The spelling of 638153228 in words is "six hundred thirty-eight million, one hundred fifty-three thousand, two hundred twenty-eight".