638332025 has 6 divisors (see below), whose sum is σ = 791531742. Its totient is φ = 510665600.

The previous prime is 638331977. The next prime is 638332049. The reversal of 638332025 is 520233836.

It can be written as a sum of positive squares in 3 ways, for example, as 466489 + 637865536 = 683^2 + 25256^2 .

It is not a de Polignac number, because 638332025 - 2¹⁸ = 638069881 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 638331982 and 638332000.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 12766616 + ... + 12766665.

It is an arithmetic number, because the mean of its divisors is an integer number (131921957).

Almost surely, 2^638332025 is an apocalyptic number.

It is an amenable number.

638332025 is a deficient number, since it is larger than the sum of its proper divisors (153199717).

638332025 is a wasteful number, since it uses less digits than its factorization.

638332025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25533291 (or 25533286 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 32.

The square root of 638332025 is about 25265.2335235596. The cubic root of 638332025 is about 861.0245698515.

The spelling of 638332025 in words is "six hundred thirty-eight million, three hundred thirty-two thousand, twenty-five".