638377452 has 18 divisors (see below), whose sum is σ = 1613676428. Its totient is φ = 212792472.

The previous prime is 638377403. The next prime is 638377457. The reversal of 638377452 is 254773836.

638377452 is a `hidden beast` number, since 638 + 3 + 7 + 7 + 4 + 5 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a junction number, because it is equal to n+sod(n) for n = 638377398 and 638377407.

It is not an unprimeable number, because it can be changed into a prime (638377457) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8866318 + ... + 8866389.

Almost surely, 2^638377452 is an apocalyptic number.

It is an amenable number.

638377452 is an abundant number, since it is smaller than the sum of its proper divisors (975298976).

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

638377452 is a wasteful number, since it uses less digits than its factorization.

638377452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17732717 (or 17732712 counting only the distinct ones).

The product of its digits is 846720, while the sum is 45.

The square root of 638377452 is about 25266.1325097451. The cubic root of 638377452 is about 861.0449943505.

It can be divided in two parts, 63837 and 7452, that added together give a square (71289 = 267²).

The spelling of 638377452 in words is "six hundred thirty-eight million, three hundred seventy-seven thousand, four hundred fifty-two".