646531248 has 80 divisors (see below), whose sum is σ = 1860880896. Its totient is φ = 191742720.

The previous prime is 646531231. The next prime is 646531261. The reversal of 646531248 is 842135646.

It is a super-3 number, since 3×646531248³ (a number of 27 digits) contains 333 as substring.

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 15 ways as a sum of consecutive naturals, for example, 11790 + ... + 37842.

Almost surely, 2^646531248 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 646531248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (930440448).

646531248 is an abundant number, since it is smaller than the sum of its proper divisors (1214349648).

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

646531248 is a wasteful number, since it uses less digits than its factorization.

646531248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26122 (or 26116 counting only the distinct ones).

The product of its digits is 138240, while the sum is 39.

The square root of 646531248 is about 25426.9787430595. The cubic root of 646531248 is about 864.6954491580.

The spelling of 646531248 in words is "six hundred forty-six million, five hundred thirty-one thousand, two hundred forty-eight".