638625 has 32 divisors (see below), whose sum is σ = 1153152. Its totient is φ = 312000.

The previous prime is 638621. The next prime is 638629. The reversal of 638625 is 526836.

It is an interprime number because it is at equal distance from previous prime (638621) and next prime (638629).

It is not a de Polignac number, because 638625 - 2² = 638621 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 638592 and 638601.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 638625.

It is not an unprimeable number, because it can be changed into a prime (638621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4810 + ... + 4940.

It is an arithmetic number, because the mean of its divisors is an integer number (36036).

2⁶³⁸⁶²⁵ is an apocalyptic number.

638625 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

638625 is a deficient number, since it is larger than the sum of its proper divisors (514527).

638625 is a wasteful number, since it uses less digits than its factorization.

638625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162 (or 152 counting only the distinct ones).

The product of its digits is 8640, while the sum is 30.

The square root of 638625 is about 799.1401629251. The cubic root of 638625 is about 86.1156277740.

The spelling of 638625 in words is "six hundred thirty-eight thousand, six hundred twenty-five".