641847387 has 6 divisors (see below), whose sum is σ = 855855028. Its totient is φ = 427869004.

The previous prime is 641847289. The next prime is 641847389. The reversal of 641847387 is 783748146.

It is not a de Polignac number, because 641847387 - 2⁷ = 641847259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641847389) 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 5 ways as a sum of consecutive naturals, for example, 36568 + ... + 51194.

Almost surely, 2^641847387 is an apocalyptic number.

641847387 is a deficient number, since it is larger than the sum of its proper divisors (214007641).

641847387 is an frugal number, since it uses more digits than its factorization.

641847387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29257 (or 14630 counting only the distinct ones).

The product of its digits is 903168, while the sum is 48.

The square root of 641847387 is about 25334.7071623100. The cubic root of 641847387 is about 862.6022616830.

Multiplying 641847387 by its sum of digits (48), we get a square (30808674576 = 175524²).

The spelling of 641847387 in words is "six hundred forty-one million, eight hundred forty-seven thousand, three hundred eighty-seven".