646434480 has 80 divisors (see below), whose sum is σ = 2050583040. Its totient is φ = 168370944.

The previous prime is 646434463. The next prime is 646434497. The reversal of 646434480 is 84434646.

646434480 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (646434463) and next prime (646434497).

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21000 + ... + 41639.

It is an arithmetic number, because the mean of its divisors is an integer number (25632288).

Almost surely, 2^646434480 is an apocalyptic number.

646434480 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

646434480 is an abundant number, since it is smaller than the sum of its proper divisors (1404148560).

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

646434480 is a wasteful number, since it uses less digits than its factorization.

646434480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62698 (or 62692 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 39.

The square root of 646434480 is about 25425.0758110964. The cubic root of 646434480 is about 864.6523066059.

The spelling of 646434480 in words is "six hundred forty-six million, four hundred thirty-four thousand, four hundred eighty".