3215523820 has 72 divisors (see below), whose sum is σ = 7219299024. Its totient is φ = 1202770944.

The previous prime is 3215523743. The next prime is 3215523821. The reversal of 3215523820 is 283255123.

It is not an unprimeable number, because it can be changed into a prime (3215523821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 940434 + ... + 943846.

It is an arithmetic number, because the mean of its divisors is an integer number (100268042).

Almost surely, 2^3215523820 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3215523820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3609649512).

3215523820 is an abundant number, since it is smaller than the sum of its proper divisors (4003775204).

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

3215523820 is a wasteful number, since it uses less digits than its factorization.

3215523820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3619 (or 3600 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 3215523820 is about 56705.5889661681. The cubic root of 3215523820 is about 1475.9916832056.

Adding to 3215523820 its reverse (283255123), we get a palindrome (3498778943).

The spelling of 3215523820 in words is "three billion, two hundred fifteen million, five hundred twenty-three thousand, eight hundred twenty".