638652276 has 30 divisors (see below), whose sum is σ = 1669564050. Its totient is φ = 212883984.

The previous prime is 638652271. The next prime is 638652283. The reversal of 638652276 is 672256836.

It is a happy number.

638652276 is a `hidden beast` number, since 638 + 6 + 5 + 2 + 2 + 7 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 608115600 + 30536676 = 24660^2 + 5526^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638652271) by changing a digit.

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 9 ways as a sum of consecutive naturals, for example, 985251 + ... + 985898.

It is an arithmetic number, because the mean of its divisors is an integer number (55652135).

Almost surely, 2^638652276 is an apocalyptic number.

It is an amenable number.

638652276 is an abundant number, since it is smaller than the sum of its proper divisors (1030911774).

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

638652276 is a wasteful number, since it uses less digits than its factorization.

638652276 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1971165 (or 1971154 counting only the distinct ones).

The product of its digits is 725760, while the sum is 45.

The square root of 638652276 is about 25271.5705091710. The cubic root of 638652276 is about 861.1685377073.

The spelling of 638652276 in words is "six hundred thirty-eight million, six hundred fifty-two thousand, two hundred seventy-six".