641478850 has 72 divisors (see below), whose sum is σ = 1282739328. Its totient is φ = 238598400.

The previous prime is 641478841. The next prime is 641478853. The reversal of 641478850 is 58874146.

It is a super-2 number, since 2×641478850² = 822990229994645000, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 641478797 and 641478806.

It is not an unprimeable number, because it can be changed into a prime (641478853) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1488135 + ... + 1488565.

It is an arithmetic number, because the mean of its divisors is an integer number (17815824).

Almost surely, 2^641478850 is an apocalyptic number.

641478850 is a deficient number, since it is larger than the sum of its proper divisors (641260478).

641478850 is a wasteful number, since it uses less digits than its factorization.

641478850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 580 (or 558 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 43.

The square root of 641478850 is about 25327.4327558085. The cubic root of 641478850 is about 862.4371332740.

It can be divided in two parts, 6414 and 78850, that added together give a square (85264 = 292²).

The spelling of 641478850 in words is "six hundred forty-one million, four hundred seventy-eight thousand, eight hundred fifty".