646620102 has 48 divisors (see below), whose sum is σ = 1439448192. Its totient is φ = 209658240.

The previous prime is 646620083. The next prime is 646620113. The reversal of 646620102 is 201026646.

It is a happy number.

646620102 is a `hidden beast` number, since 646 + 6 + 2 + 0 + 10 + 2 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 291883 + ... + 294089.

It is an arithmetic number, because the mean of its divisors is an integer number (29988504).

Almost surely, 2^646620102 is an apocalyptic number.

646620102 is an abundant number, since it is smaller than the sum of its proper divisors (792828090).

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

646620102 is a wasteful number, since it uses less digits than its factorization.

646620102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2653 (or 2650 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 646620102 is about 25428.7259216816. The cubic root of 646620102 is about 864.7350595817.

Subtracting from 646620102 its product of nonzero digits (3456), we obtain a palindrome (646616646).

Adding to 646620102 its reverse (201026646), we get a palindrome (847646748).

The spelling of 646620102 in words is "six hundred forty-six million, six hundred twenty thousand, one hundred two".