638378552 has 16 divisors (see below), whose sum is σ = 1367954160. Its totient is φ = 273590784.

The previous prime is 638378519. The next prime is 638378557. The reversal of 638378552 is 255873836.

It is a junction number, because it is equal to n+sod(n) for n = 638378497 and 638378506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638378557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5699753 + ... + 5699864.

It is an arithmetic number, because the mean of its divisors is an integer number (85497135).

Almost surely, 2^638378552 is an apocalyptic number.

It is an amenable number.

638378552 is an abundant number, since it is smaller than the sum of its proper divisors (729575608).

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

638378552 is a wasteful number, since it uses less digits than its factorization.

638378552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11399630 (or 11399626 counting only the distinct ones).

The product of its digits is 1209600, while the sum is 47.

The square root of 638378552 is about 25266.1542780060. The cubic root of 638378552 is about 861.0454889110.

The spelling of 638378552 in words is "six hundred thirty-eight million, three hundred seventy-eight thousand, five hundred fifty-two".