641904630 has 32 divisors (see below), whose sum is σ = 1541342304. Its totient is φ = 171088896.

The previous prime is 641904629. The next prime is 641904667. The reversal of 641904630 is 36409146.

It is a junction number, because it is equal to n+sod(n) for n = 641904591 and 641904600.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75684 + ... + 83736.

It is an arithmetic number, because the mean of its divisors is an integer number (48166947).

Almost surely, 2^641904630 is an apocalyptic number.

641904630 is an abundant number, since it is smaller than the sum of its proper divisors (899437674).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

641904630 is a wasteful number, since it uses less digits than its factorization.

641904630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10720.

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 641904630 is about 25335.8368719093. The cubic root of 641904630 is about 862.6279045769.

The spelling of 641904630 in words is "six hundred forty-one million, nine hundred four thousand, six hundred thirty".