646462512 has 80 divisors (see below), whose sum is σ = 1870356480. Its totient is φ = 213772608.

The previous prime is 646462489. The next prime is 646462543. The reversal of 646462512 is 215264646.

646462512 is a `hidden beast` number, since 6 + 4 + 646 + 2 + 5 + 1 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 48973 + ... + 60755.

It is an arithmetic number, because the mean of its divisors is an integer number (23379456).

Almost surely, 2^646462512 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 646462512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (935178240).

646462512 is an abundant number, since it is smaller than the sum of its proper divisors (1223893968).

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

646462512 is a wasteful number, since it uses less digits than its factorization.

646462512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11927 (or 11915 counting only the distinct ones).

The product of its digits is 69120, while the sum is 36.

The square root of 646462512 is about 25425.6270719131. The cubic root of 646462512 is about 864.6648046929.

The spelling of 646462512 in words is "six hundred forty-six million, four hundred sixty-two thousand, five hundred twelve".