1664687052 has 288 divisors, whose sum is σ = 5348761600. Its totient is φ = 442158912.

The previous prime is 1664687047. The next prime is 1664687081. The reversal of 1664687052 is 2507864661.

It is a junction number, because it is equal to n+sod(n) for n = 1664686989 and 1664687007.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 10212723 + ... + 10212885.

Almost surely, 2^1664687052 is an apocalyptic number.

1664687052 is a gapful number since it is divisible by the number (12) 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 1664687052, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2674380800).

1664687052 is an abundant number, since it is smaller than the sum of its proper divisors (3684074548).

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

1664687052 is a wasteful number, since it uses less digits than its factorization.

1664687052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287 (or 273 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The square root of 1664687052 is about 40800.5766135725. The cubic root of 1664687052 is about 1185.1614969768.

The spelling of 1664687052 in words is "one billion, six hundred sixty-four million, six hundred eighty-seven thousand, fifty-two".