646712130 has 64 divisors (see below), whose sum is σ = 1647330048. Its totient is φ = 161925120.

The previous prime is 646712089. The next prime is 646712141. The reversal of 646712130 is 31217646.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 255270 + ... + 257790.

It is an arithmetic number, because the mean of its divisors is an integer number (25739532).

Almost surely, 2^646712130 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 646712130, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (823665024).

646712130 is an abundant number, since it is smaller than the sum of its proper divisors (1000617918).

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

646712130 is a wasteful number, since it uses less digits than its factorization.

646712130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3051.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 646712130 is about 25430.5353856343. The cubic root of 646712130 is about 864.7760811248.

Adding to 646712130 its reverse (31217646), we get a palindrome (677929776).

The spelling of 646712130 in words is "six hundred forty-six million, seven hundred twelve thousand, one hundred thirty".