640825485 has 16 divisors (see below), whose sum is σ = 1038301440. Its totient is φ = 337446720.

The previous prime is 640825477. The next prime is 640825513. The reversal of 640825485 is 584528046.

It is not a de Polignac number, because 640825485 - 2³ = 640825477 is a prime.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 269206 + ... + 271575.

It is an arithmetic number, because the mean of its divisors is an integer number (64893840).

Almost surely, 2^640825485 is an apocalyptic number.

It is an amenable number.

640825485 is a deficient number, since it is larger than the sum of its proper divisors (397475955).

640825485 is a wasteful number, since it uses less digits than its factorization.

640825485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 540868.

The product of its (nonzero) digits is 307200, while the sum is 42.

The square root of 640825485 is about 25314.5311036962. The cubic root of 640825485 is about 862.1442279792.

The spelling of 640825485 in words is "six hundred forty million, eight hundred twenty-five thousand, four hundred eighty-five".