1604881866 has 64 divisors (see below), whose sum is σ = 3802060800. Its totient is φ = 441878976.

The previous prime is 1604881849. The next prime is 1604881877. The reversal of 1604881866 is 6681884061.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 899211 + ... + 900993.

It is an arithmetic number, because the mean of its divisors is an integer number (59407200).

Almost surely, 2^1604881866 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1604881866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1901030400).

1604881866 is an abundant number, since it is smaller than the sum of its proper divisors (2197178934).

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

1604881866 is a wasteful number, since it uses less digits than its factorization.

1604881866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2563.

The product of its (nonzero) digits is 442368, while the sum is 48.

The square root of 1604881866 is about 40060.9768478004. The cubic root of 1604881866 is about 1170.7954427198.

The spelling of 1604881866 in words is "one billion, six hundred four million, eight hundred eighty-one thousand, eight hundred sixty-six".