646126312 has 64 divisors (see below), whose sum is σ = 1387915200. Its totient is φ = 279521280.

The previous prime is 646126309. The next prime is 646126321. The reversal of 646126312 is 213621646.

It is a super-2 number, since 2×646126312² = 834958422117442688, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 189987 + ... + 193357.

It is an arithmetic number, because the mean of its divisors is an integer number (21686175).

Almost surely, 2^646126312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 646126312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (693957600).

646126312 is an abundant number, since it is smaller than the sum of its proper divisors (741788888).

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

646126312 is a wasteful number, since it uses less digits than its factorization.

646126312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3506 (or 3502 counting only the distinct ones).

The product of its digits is 10368, while the sum is 31.

The square root of 646126312 is about 25419.0147724100. The cubic root of 646126312 is about 864.5148858601.

Adding to 646126312 its reverse (213621646), we get a palindrome (859747958).

The spelling of 646126312 in words is "six hundred forty-six million, one hundred twenty-six thousand, three hundred twelve".