641738427 has 8 divisors (see below), whose sum is σ = 933437760. Its totient is φ = 388932360.

The previous prime is 641738411. The next prime is 641738429. The reversal of 641738427 is 724837146.

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

It is not a de Polignac number, because 641738427 - 2⁴ = 641738411 is a prime.

It is not an unprimeable number, because it can be changed into a prime (641738429) by changing a digit.

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, 9723277 + ... + 9723342.

It is an arithmetic number, because the mean of its divisors is an integer number (116679720).

Almost surely, 2^641738427 is an apocalyptic number.

641738427 is a deficient number, since it is larger than the sum of its proper divisors (291699333).

641738427 is a wasteful number, since it uses less digits than its factorization.

641738427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19446633.

The product of its digits is 225792, while the sum is 42.

The square root of 641738427 is about 25332.5566613400. The cubic root of 641738427 is about 862.5534471395.

It can be divided in two parts, 6417 and 38427, that added together give a palindrome (44844).

The spelling of 641738427 in words is "six hundred forty-one million, seven hundred thirty-eight thousand, four hundred twenty-seven".