646315340 has 48 divisors (see below), whose sum is σ = 1482395040. Its totient is φ = 234746880.

The previous prime is 646315339. The next prime is 646315379. The reversal of 646315340 is 43513646.

It is a junction number, because it is equal to n+sod(n) for n = 646315297 and 646315306.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 326594 + ... + 328566.

It is an arithmetic number, because the mean of its divisors is an integer number (30883230).

Almost surely, 2^646315340 is an apocalyptic number.

It is an amenable number.

646315340 is an abundant number, since it is smaller than the sum of its proper divisors (836079700).

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

646315340 is a wasteful number, since it uses less digits than its factorization.

646315340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3482 (or 3480 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 32.

The square root of 646315340 is about 25422.7327406005. The cubic root of 646315340 is about 864.5991839213.

Adding to 646315340 its reverse (43513646), we get a palindrome (689828986).

The spelling of 646315340 in words is "six hundred forty-six million, three hundred fifteen thousand, three hundred forty".