641404025 has 24 divisors (see below), whose sum is σ = 804543000. Its totient is φ = 507225600.

The previous prime is 641404021. The next prime is 641404037. The reversal of 641404025 is 520404146.

641404025 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 12 ways, for example, as 372837481 + 268566544 = 19309^2 + 16388^2 .

It is not a de Polignac number, because 641404025 - 2² = 641404021 is a prime.

It is a super-2 number, since 2×641404025² = 822798246572401250, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 641403985 and 641404003.

It is not an unprimeable number, because it can be changed into a prime (641404021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1523315 + ... + 1523735.

It is an arithmetic number, because the mean of its divisors is an integer number (33522625).

Almost surely, 2^641404025 is an apocalyptic number.

It is an amenable number.

641404025 is a deficient number, since it is larger than the sum of its proper divisors (163138975).

641404025 is a wasteful number, since it uses less digits than its factorization.

641404025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 989 (or 984 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 641404025 is about 25325.9555594651. The cubic root of 641404025 is about 862.4035991116.

The spelling of 641404025 in words is "six hundred forty-one million, four hundred four thousand, twenty-five".