641003978 has 4 divisors (see below), whose sum is σ = 961505970. Its totient is φ = 320501988.

The previous prime is 641003977. The next prime is 641003983. The reversal of 641003978 is 879300146.

641003978 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., 441714289 + 199289689 = 21017^2 + 14117^2 .

It is not an unprimeable number, because it can be changed into a prime (641003971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160250993 + ... + 160250996.

Almost surely, 2^641003978 is an apocalyptic number.

641003978 is a deficient number, since it is larger than the sum of its proper divisors (320501992).

641003978 is a wasteful number, since it uses less digits than its factorization.

641003978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320501991.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 641003978 is about 25318.0563629991. The cubic root of 641003978 is about 862.2242666314.

The spelling of 641003978 in words is "six hundred forty-one million, three thousand, nine hundred seventy-eight".