646241040 has 60 divisors (see below), whose sum is σ = 2170295244. Its totient is φ = 172330752.

The previous prime is 646241039. The next prime is 646241081. The reversal of 646241040 is 40142646.

646241040 is a `hidden beast` number, since 646 + 2 + 4 + 10 + 4 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 108743184 + 537497856 = 10428^2 + 23184^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a junction number, because it is equal to n+sod(n) for n = 646240995 and 646241013.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 448059 + ... + 449498.

Almost surely, 2^646241040 is an apocalyptic number.

646241040 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

646241040 is an abundant number, since it is smaller than the sum of its proper divisors (1524054204).

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

646241040 is a wasteful number, since it uses less digits than its factorization.

646241040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 897576 (or 897567 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 646241040 is about 25421.2714080158. The cubic root of 646241040 is about 864.5660513944.

Adding to 646241040 its reverse (40142646), we get a palindrome (686383686).

The spelling of 646241040 in words is "six hundred forty-six million, two hundred forty-one thousand, forty".