1565003220 has 96 divisors (see below), whose sum is σ = 4818272256. Its totient is φ = 376387200.

The previous prime is 1565003207. The next prime is 1565003249. The reversal of 1565003220 is 223005651.

It is a super-2 number, since 2×1565003220² = 4898470157220736800, 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 31 ways as a sum of consecutive naturals, for example, 74485 + ... + 93155.

It is an arithmetic number, because the mean of its divisors is an integer number (50190336).

Almost surely, 2^1565003220 is an apocalyptic number.

1565003220 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 1565003220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2409136128).

1565003220 is an abundant number, since it is smaller than the sum of its proper divisors (3253269036).

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

1565003220 is a wasteful number, since it uses less digits than its factorization.

1565003220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18821 (or 18819 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 1565003220 is about 39560.1215872752. The cubic root of 1565003220 is about 1161.0165534047.

Adding to 1565003220 its reverse (223005651), we get a palindrome (1788008871).

The spelling of 1565003220 in words is "one billion, five hundred sixty-five million, three thousand, two hundred twenty".