640546025 has 48 divisors (see below), whose sum is σ = 950796288. Its totient is φ = 418824000.

The previous prime is 640546013. The next prime is 640546057. The reversal of 640546025 is 520645046.

640546025 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 640546025 - 2⁸ = 640545769 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 640545982 and 640546000.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 384344 + ... + 386006.

It is an arithmetic number, because the mean of its divisors is an integer number (19808256).

Almost surely, 2^640546025 is an apocalyptic number.

It is an amenable number.

640546025 is a deficient number, since it is larger than the sum of its proper divisors (310250263).

640546025 is a wasteful number, since it uses less digits than its factorization.

640546025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1782 (or 1777 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 32.

The square root of 640546025 is about 25309.0107471628. The cubic root of 640546025 is about 862.0188845155.

The spelling of 640546025 in words is "six hundred forty million, five hundred forty-six thousand, twenty-five".