1664030520 has 128 divisors (see below), whose sum is σ = 5556038400. Its totient is φ = 443000448.

The previous prime is 1664030497. The next prime is 1664030521. The reversal of 1664030520 is 250304661.

1664030520 is a `hidden beast` number, since 16 + 640 + 3 + 0 + 5 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664030521) 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, 1021947 + ... + 1023573.

It is an arithmetic number, because the mean of its divisors is an integer number (43406550).

Almost surely, 2^1664030520 is an apocalyptic number.

1664030520 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 1664030520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2778019200).

1664030520 is an abundant number, since it is smaller than the sum of its proper divisors (3892007880).

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

1664030520 is a wasteful number, since it uses less digits than its factorization.

1664030520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2594 (or 2584 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 1664030520 is about 40792.5301985547. The cubic root of 1664030520 is about 1185.0056721408.

The spelling of 1664030520 in words is "one billion, six hundred sixty-four million, thirty thousand, five hundred twenty".