641922240 has 224 divisors, whose sum is σ = 2138379264. Its totient is φ = 162979840.

The previous prime is 641922233. The next prime is 641922241. The reversal of 641922240 is 42229146.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 641922198 and 641922207.

It is not an unprimeable number, because it can be changed into a prime (641922241) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1849747 + ... + 1850093.

It is an arithmetic number, because the mean of its divisors is an integer number (9546336).

Almost surely, 2^641922240 is an apocalyptic number.

641922240 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 641922240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1069189632).

641922240 is an abundant number, since it is smaller than the sum of its proper divisors (1496457024).

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

641922240 is a wasteful number, since it uses less digits than its factorization.

641922240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 455 (or 445 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 641922240 is about 25336.1844009709. The cubic root of 641922240 is about 862.6357929442.

The spelling of 641922240 in words is "six hundred forty-one million, nine hundred twenty-two thousand, two hundred forty".