1664532480 has 240 divisors, whose sum is σ = 5747069664. Its totient is φ = 408944640.

The previous prime is 1664532439. The next prime is 1664532481. The reversal of 1664532480 is 842354661.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (1664532481) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3194620 + ... + 3195140.

Almost surely, 2^1664532480 is an apocalyptic number.

1664532480 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 1664532480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2873534832).

1664532480 is an abundant number, since it is smaller than the sum of its proper divisors (4082537184).

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

1664532480 is an equidigital number, since it uses as much as digits as its factorization.

1664532480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 570 (or 544 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 39.

The square root of 1664532480 is about 40798.6823316636. The cubic root of 1664532480 is about 1185.1248137149.

The spelling of 1664532480 in words is "one billion, six hundred sixty-four million, five hundred thirty-two thousand, four hundred eighty".