641804090 has 16 divisors (see below), whose sum is σ = 1163003400. Its totient is φ = 254998080.

The previous prime is 641804087. The next prime is 641804113. The reversal of 641804090 is 90408146.

It can be written as a sum of positive squares in 4 ways, for example, as 556629649 + 85174441 = 23593^2 + 9229^2 .

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 7 ways as a sum of consecutive naturals, for example, 213881 + ... + 216860.

Almost surely, 2^641804090 is an apocalyptic number.

641804090 is a deficient number, since it is larger than the sum of its proper divisors (521199310).

641804090 is a wasteful number, since it uses less digits than its factorization.

641804090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430897.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 641804090 is about 25333.8526481860. The cubic root of 641804090 is about 862.5828651043.

The spelling of 641804090 in words is "six hundred forty-one million, eight hundred four thousand, ninety".