646503012 has 48 divisors (see below), whose sum is σ = 1677614400. Its totient is φ = 215308800.

The previous prime is 646502971. The next prime is 646503023. The reversal of 646503012 is 210305646.

646503012 is a `hidden beast` number, since 6 + 4 + 650 + 3 + 0 + 1 + 2 = 666.

It is a super-2 number, since 2×646503012² = 835932289050144288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

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, 171039 + ... + 174777.

It is an arithmetic number, because the mean of its divisors is an integer number (34950300).

Almost surely, 2^646503012 is an apocalyptic number.

It is an amenable number.

646503012 is an abundant number, since it is smaller than the sum of its proper divisors (1031111388).

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

646503012 is a wasteful number, since it uses less digits than its factorization.

646503012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5353 (or 5345 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 646503012 is about 25426.4234999734. The cubic root of 646503012 is about 864.6828610085.

Adding to 646503012 its reverse (210305646), we get a palindrome (856808658).

The spelling of 646503012 in words is "six hundred forty-six million, five hundred three thousand, twelve".