638565652 has 96 divisors (see below), whose sum is σ = 1271660544. Its totient is φ = 279417600.

The previous prime is 638565619. The next prime is 638565659. The reversal of 638565652 is 256565836.

638565652 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638565659) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5028013 + ... + 5028139.

It is an arithmetic number, because the mean of its divisors is an integer number (13246464).

Almost surely, 2^638565652 is an apocalyptic number.

638565652 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

638565652 is a deficient number, since it is larger than the sum of its proper divisors (633094892).

638565652 is a wasteful number, since it uses less digits than its factorization.

638565652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269 (or 267 counting only the distinct ones).

The product of its digits is 1296000, while the sum is 46.

The square root of 638565652 is about 25269.8565884336. The cubic root of 638565652 is about 861.1296009029.

The spelling of 638565652 in words is "six hundred thirty-eight million, five hundred sixty-five thousand, six hundred fifty-two".