641685280 has 96 divisors (see below), whose sum is σ = 1595510784. Its totient is φ = 243403776.

The previous prime is 641685277. The next prime is 641685287. The reversal of 641685280 is 82586146.

641685280 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (641685287) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 466674 + ... + 468046.

It is an arithmetic number, because the mean of its divisors is an integer number (16619904).

Almost surely, 2^641685280 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 641685280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (797755392).

641685280 is an abundant number, since it is smaller than the sum of its proper divisors (953825504).

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

641685280 is a wasteful number, since it uses less digits than its factorization.

641685280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1538 (or 1530 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 40.

The square root of 641685280 is about 25331.5076535132. The cubic root of 641685280 is about 862.5296350526.

The spelling of 641685280 in words is "six hundred forty-one million, six hundred eighty-five thousand, two hundred eighty".