646241340 has 48 divisors (see below), whose sum is σ = 1823310720. Its totient is φ = 171013440.

The previous prime is 646241317. The next prime is 646241341. The reversal of 646241340 is 43142646.

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 = 646241298 and 646241307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646241341) 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, 33250 + ... + 48969.

It is an arithmetic number, because the mean of its divisors is an integer number (37985640).

Almost surely, 2^646241340 is an apocalyptic number.

646241340 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

646241340 is an abundant number, since it is smaller than the sum of its proper divisors (1177069380).

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

646241340 is a wasteful number, since it uses less digits than its factorization.

646241340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82362 (or 82360 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 30.

The square root of 646241340 is about 25421.2773085854. The cubic root of 646241340 is about 864.5661851782.

Adding to 646241340 its reverse (43142646), we get a palindrome (689383986).

The spelling of 646241340 in words is "six hundred forty-six million, two hundred forty-one thousand, three hundred forty".