638711230 has 16 divisors (see below), whose sum is σ = 1152150480. Its totient is φ = 254935552.

The previous prime is 638711221. The next prime is 638711251. The reversal of 638711230 is 32117836.

It is a super-2 number, since 2×638711230² = 815904070656225800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 638711192 and 638711201.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63715 + ... + 73054.

It is an arithmetic number, because the mean of its divisors is an integer number (72009405).

Almost surely, 2^638711230 is an apocalyptic number.

638711230 is a deficient number, since it is larger than the sum of its proper divisors (513439250).

638711230 is a wasteful number, since it uses less digits than its factorization.

638711230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137243.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 638711230 is about 25272.7368917575. The cubic root of 638711230 is about 861.1950350517.

The spelling of 638711230 in words is "six hundred thirty-eight million, seven hundred eleven thousand, two hundred thirty".