1664375460 has 96 divisors (see below), whose sum is σ = 5096577024. Its totient is φ = 402480000.

The previous prime is 1664375431. The next prime is 1664375467. The reversal of 1664375460 is 645734661.

It is not an unprimeable number, because it can be changed into a prime (1664375467) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 281535 + ... + 287385.

It is an arithmetic number, because the mean of its divisors is an integer number (53089344).

Almost surely, 2^1664375460 is an apocalyptic number.

1664375460 is a gapful number since it is divisible by the number (10) 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 1664375460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2548288512).

1664375460 is an abundant number, since it is smaller than the sum of its proper divisors (3432201564).

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

1664375460 is a wasteful number, since it uses less digits than its factorization.

1664375460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6305 (or 6303 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 42.

The square root of 1664375460 is about 40796.7579594261. The cubic root of 1664375460 is about 1185.0875471647.

The spelling of 1664375460 in words is "one billion, six hundred sixty-four million, three hundred seventy-five thousand, four hundred sixty".