646253472 has 48 divisors (see below), whose sum is σ = 1697909472. Its totient is φ = 215228160.

The previous prime is 646253467. The next prime is 646253473. The reversal of 646253472 is 274352646.

It is a tau number, because it is divible by the number of its divisors (48).

It is a self number, because there is not a number n which added to its sum of digits gives 646253472.

It is not an unprimeable number, because it can be changed into a prime (646253473) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 144778 + ... + 149174.

It is an arithmetic number, because the mean of its divisors is an integer number (35373114).

Almost surely, 2^646253472 is an apocalyptic number.

It is an amenable number.

646253472 is an abundant number, since it is smaller than the sum of its proper divisors (1051656000).

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

646253472 is a wasteful number, since it uses less digits than its factorization.

646253472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5941 (or 5933 counting only the distinct ones).

The product of its digits is 241920, while the sum is 39.

The square root of 646253472 is about 25421.5159264746. The cubic root of 646253472 is about 864.5715953610.

The spelling of 646253472 in words is "six hundred forty-six million, two hundred fifty-three thousand, four hundred seventy-two".