1065899520 has 320 divisors, whose sum is σ = 4329008640. Its totient is φ = 243523584.

The previous prime is 1065899519. The next prime is 1065899531. The reversal of 1065899520 is 259985601.

1065899520 is a `hidden beast` number, since 10 + 6 + 589 + 9 + 52 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (320).

It is a super-2 number, since 2×1065899520² = 2272283573472460800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 482739 + ... + 484941.

It is an arithmetic number, because the mean of its divisors is an integer number (13528152).

Almost surely, 2^1065899520 is an apocalyptic number.

1065899520 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 1065899520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2164504320).

1065899520 is an abundant number, since it is smaller than the sum of its proper divisors (3263109120).

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

1065899520 is an equidigital number, since it uses as much as digits as its factorization.

1065899520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2242 (or 2220 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 45.

The square root of 1065899520 is about 32648.1166378706. The cubic root of 1065899520 is about 1021.5009045600.

The spelling of 1065899520 in words is "one billion, sixty-five million, eight hundred ninety-nine thousand, five hundred twenty".