638867112 has 32 divisors (see below), whose sum is σ = 1720027680. Its totient is φ = 196574400.

The previous prime is 638867111. The next prime is 638867137. The reversal of 638867112 is 211768836.

It is not an unprimeable number, because it can be changed into a prime (638867111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1023514 + ... + 1024137.

It is an arithmetic number, because the mean of its divisors is an integer number (53750865).

Almost surely, 2^638867112 is an apocalyptic number.

It is an amenable number.

638867112 is an abundant number, since it is smaller than the sum of its proper divisors (1081160568).

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

638867112 is a wasteful number, since it uses less digits than its factorization.

638867112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2047673 (or 2047669 counting only the distinct ones).

The product of its digits is 96768, while the sum is 42.

The square root of 638867112 is about 25275.8206988418. The cubic root of 638867112 is about 861.2650896024.

The spelling of 638867112 in words is "six hundred thirty-eight million, eight hundred sixty-seven thousand, one hundred twelve".