641654374 has 4 divisors (see below), whose sum is σ = 962481564. Its totient is φ = 320827186.

The previous prime is 641654371. The next prime is 641654381. The reversal of 641654374 is 473456146.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641654371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160413592 + ... + 160413595.

It is an arithmetic number, because the mean of its divisors is an integer number (240620391).

Almost surely, 2^641654374 is an apocalyptic number.

641654374 is a deficient number, since it is larger than the sum of its proper divisors (320827190).

641654374 is a wasteful number, since it uses less digits than its factorization.

641654374 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320827189.

The product of its digits is 241920, while the sum is 40.

The square root of 641654374 is about 25330.8976153629. The cubic root of 641654374 is about 862.5157872627.

The spelling of 641654374 in words is "six hundred forty-one million, six hundred fifty-four thousand, three hundred seventy-four".