640003025 has 12 divisors (see below), whose sum is σ = 794210700. Its totient is φ = 511610880.

The previous prime is 640003019. The next prime is 640003027. The reversal of 640003025 is 520300046.

640003025 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 250177489 + 389825536 = 15817^2 + 19744^2 .

It is not a de Polignac number, because 640003025 - 2⁴ = 640003009 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 640002988 and 640003006.

It is not an unprimeable number, because it can be changed into a prime (640003027) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26141 + ... + 44309.

It is an arithmetic number, because the mean of its divisors is an integer number (66184225).

Almost surely, 2^640003025 is an apocalyptic number.

It is an amenable number.

640003025 is a deficient number, since it is larger than the sum of its proper divisors (154207675).

640003025 is a wasteful number, since it uses less digits than its factorization.

640003025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19588 (or 19583 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 640003025 is about 25298.2810680884. The cubic root of 640003025 is about 861.7752337533.

The spelling of 640003025 in words is "six hundred forty million, three thousand, twenty-five".