1664546784 has 96 divisors (see below), whose sum is σ = 4447529856. Its totient is φ = 545026560.

The previous prime is 1664546773. The next prime is 1664546837. The reversal of 1664546784 is 4876454661.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×1664546784² = 5541431992249485312, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1345014 + ... + 1346250.

It is an arithmetic number, because the mean of its divisors is an integer number (46328436).

Almost surely, 2^1664546784 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1664546784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2223764928).

1664546784 is an abundant number, since it is smaller than the sum of its proper divisors (2782983072).

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

1664546784 is a wasteful number, since it uses less digits than its factorization.

1664546784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1488 (or 1480 counting only the distinct ones).

The product of its digits is 3870720, while the sum is 51.

The square root of 1664546784 is about 40798.8576310661. The cubic root of 1664546784 is about 1185.1282084573.

The spelling of 1664546784 in words is "one billion, six hundred sixty-four million, five hundred forty-six thousand, seven hundred eighty-four".