1646445860 has 48 divisors (see below), whose sum is σ = 3481470720. Its totient is φ = 654040320.

The previous prime is 1646445841. The next prime is 1646445881. The reversal of 1646445860 is 685446461.

It is a super-2 number, since 2×1646445860² = 5421567939822279200, which contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 3525347 + ... + 3525813.

It is an arithmetic number, because the mean of its divisors is an integer number (72530640).

Almost surely, 2^1646445860 is an apocalyptic number.

1646445860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1646445860 is an abundant number, since it is smaller than the sum of its proper divisors (1835024860).

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

1646445860 is a wasteful number, since it uses less digits than its factorization.

1646445860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1316 (or 1314 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 44.

The square root of 1646445860 is about 40576.4199997979. The cubic root of 1646445860 is about 1180.8166949890.

The spelling of 1646445860 in words is "one billion, six hundred forty-six million, four hundred forty-five thousand, eight hundred sixty".