1664421060 has 48 divisors (see below), whose sum is σ = 4708440576. Its totient is φ = 439268352.

The previous prime is 1664421049. The next prime is 1664421079. The reversal of 1664421060 is 601244661.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 137172 + ... + 148811.

It is an arithmetic number, because the mean of its divisors is an integer number (98092512).

Almost surely, 2^1664421060 is an apocalyptic number.

1664421060 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1664421060 is an abundant number, since it is smaller than the sum of its proper divisors (3044019516).

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

1664421060 is a wasteful number, since it uses less digits than its factorization.

1664421060 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286092 (or 286090 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 1664421060 is about 40797.3168235363. The cubic root of 1664421060 is about 1185.0983699427.

The spelling of 1664421060 in words is "one billion, six hundred sixty-four million, four hundred twenty-one thousand, sixty".