641042378 has 4 divisors (see below), whose sum is σ = 961563570. Its totient is φ = 320521188.

The previous prime is 641042371. The next prime is 641042383. The reversal of 641042378 is 873240146.

641042378 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in only one way, i.e., 627151849 + 13890529 = 25043^2 + 3727^2 .

It is not an unprimeable number, because it can be changed into a prime (641042371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160260593 + ... + 160260596.

Almost surely, 2^641042378 is an apocalyptic number.

641042378 is a deficient number, since it is larger than the sum of its proper divisors (320521192).

641042378 is a wasteful number, since it uses less digits than its factorization.

641042378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320521191.

The product of its (nonzero) digits is 32256, while the sum is 35.

The square root of 641042378 is about 25318.8147036942. The cubic root of 641042378 is about 862.2414837636.

The spelling of 641042378 in words is "six hundred forty-one million, forty-two thousand, three hundred seventy-eight".