646640160 has 96 divisors (see below), whose sum is σ = 2102671872. Its totient is φ = 166871040.

The previous prime is 646640143. The next prime is 646640161. The reversal of 646640160 is 61046646.

It is a tau number, because it is divible by the number of its divisors (96).

It is not an unprimeable number, because it can be changed into a prime (646640161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6849 + ... + 36608.

It is an arithmetic number, because the mean of its divisors is an integer number (21902832).

Almost surely, 2^646640160 is an apocalyptic number.

646640160 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 646640160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1051335936).

646640160 is an abundant number, since it is smaller than the sum of its proper divisors (1456031712).

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

646640160 is a wasteful number, since it uses less digits than its factorization.

646640160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43506 (or 43498 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 33.

The square root of 646640160 is about 25429.1203151033. The cubic root of 646640160 is about 864.7440007805.

The spelling of 646640160 in words is "six hundred forty-six million, six hundred forty thousand, one hundred sixty".