646115100 has 36 divisors (see below), whose sum is σ = 1869427224. Its totient is φ = 172297280.

The previous prime is 646115089. The next prime is 646115101. The reversal of 646115100 is 1511646.

646115100 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646115101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1076559 + ... + 1077158.

It is an arithmetic number, because the mean of its divisors is an integer number (51928534).

Almost surely, 2^646115100 is an apocalyptic number.

646115100 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

646115100 is an abundant number, since it is smaller than the sum of its proper divisors (1223312124).

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

646115100 is a wasteful number, since it uses less digits than its factorization.

646115100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2153734 (or 2153727 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 646115100 is about 25418.7942278937. The cubic root of 646115100 is about 864.5098852914.

Adding to 646115100 its reverse (1511646), we get a palindrome (647626746).

The spelling of 646115100 in words is "six hundred forty-six million, one hundred fifteen thousand, one hundred".