641685274 has 8 divisors (see below), whose sum is σ = 962761140. Its totient is φ = 320764896.

The previous prime is 641685269. The next prime is 641685277. The reversal of 641685274 is 472586146.

It can be written as a sum of positive squares in 2 ways, for example, as 571544649 + 70140625 = 23907^2 + 8375^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 641685274.

It is not an unprimeable number, because it can be changed into a prime (641685277) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 27939 + ... + 45430.

Almost surely, 2^641685274 is an apocalyptic number.

641685274 is a deficient number, since it is larger than the sum of its proper divisors (321075866).

641685274 is a wasteful number, since it uses less digits than its factorization.

641685274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77744.

The product of its digits is 322560, while the sum is 43.

The square root of 641685274 is about 25331.5075350837. The cubic root of 641685274 is about 862.5296323643.

The spelling of 641685274 in words is "six hundred forty-one million, six hundred eighty-five thousand, two hundred seventy-four".