638046825 has 72 divisors (see below), whose sum is σ = 1160015040. Its totient is φ = 309254400.

The previous prime is 638046823. The next prime is 638046853. The reversal of 638046825 is 528640836.

It is not a de Polignac number, because 638046825 - 2¹ = 638046823 is a prime.

It is not an unprimeable number, because it can be changed into a prime (638046821) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 899571 + ... + 900279.

It is an arithmetic number, because the mean of its divisors is an integer number (16111320).

Almost surely, 2^638046825 is an apocalyptic number.

638046825 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

638046825 is a deficient number, since it is larger than the sum of its proper divisors (521968215).

638046825 is a wasteful number, since it uses less digits than its factorization.

638046825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 819 (or 801 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 42.

The square root of 638046825 is about 25259.5887733748. The cubic root of 638046825 is about 860.8963185243.

The spelling of 638046825 in words is "six hundred thirty-eight million, forty-six thousand, eight hundred twenty-five".