1646376064 has 32 divisors (see below), whose sum is σ = 3422499840. Its totient is φ = 787395840.

The previous prime is 1646376029. The next prime is 1646376077. The reversal of 1646376064 is 4606736461.

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×1646376064² = 5421108288224264192, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1646376064.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 276672 + ... + 282559.

It is an arithmetic number, because the mean of its divisors is an integer number (106953120).

Almost surely, 2^1646376064 is an apocalyptic number.

It is an amenable number.

1646376064 is an abundant number, since it is smaller than the sum of its proper divisors (1776123776).

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

1646376064 is an equidigital number, since it uses as much as digits as its factorization.

1646376064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 559268 (or 559256 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 43.

The square root of 1646376064 is about 40575.5599345222. The cubic root of 1646376064 is about 1180.8000090579.

The spelling of 1646376064 in words is "one billion, six hundred forty-six million, three hundred seventy-six thousand, sixty-four".