3220156544 has 96 divisors (see below), whose sum is σ = 7087556700. Its totient is φ = 1456209920.

The previous prime is 3220156529. The next prime is 3220156553. The reversal of 3220156544 is 4456510223.

It can be written as a sum of positive squares in 2 ways, for example, as 2351086144 + 869070400 = 48488^2 + 29480^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a self number, because there is not a number n which added to its sum of digits gives 3220156544.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3980012 + ... + 3980820.

Almost surely, 2^3220156544 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 3220156544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3543778350).

3220156544 is an abundant number, since it is smaller than the sum of its proper divisors (3867400156).

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

3220156544 is a wasteful number, since it uses less digits than its factorization.

3220156544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1102 (or 1079 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 32.

The square root of 3220156544 is about 56746.4231824350. The cubic root of 3220156544 is about 1476.7001816493.

Adding to 3220156544 its reverse (4456510223), we get a palindrome (7676666767).

The spelling of 3220156544 in words is "three billion, two hundred twenty million, one hundred fifty-six thousand, five hundred forty-four".