646940160 has 240 divisors, whose sum is σ = 2296152144. Its totient is φ = 168247296.

The previous prime is 646940087. The next prime is 646940233. The reversal of 646940160 is 61049646.

646940160 is a `hidden beast` number, since 646 + 9 + 4 + 0 + 1 + 6 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (646940087) and next prime (646940233).

It is a tau number, because it is divible by the number of its divisors (240).

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

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 990394 + ... + 991046.

Almost surely, 2^646940160 is an apocalyptic number.

646940160 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 646940160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1148076072).

646940160 is an abundant number, since it is smaller than the sum of its proper divisors (1649211984).

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

646940160 is a wasteful number, since it uses less digits than its factorization.

646940160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 725 (or 706 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 646940160 is about 25435.0183801781. The cubic root of 646940160 is about 864.8777088858.

The spelling of 646940160 in words is "six hundred forty-six million, nine hundred forty thousand, one hundred sixty".