623221220 has 24 divisors (see below), whose sum is σ = 1318323384. Its totient is φ = 247467776.

The previous prime is 623221219. The next prime is 623221237. The reversal of 623221220 is 22122326.

It can be written as a sum of positive squares in 4 ways, for example, as 130736356 + 492484864 = 11434^2 + 22192^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 623221192 and 623221201.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110987 + ... + 116466.

It is an arithmetic number, because the mean of its divisors is an integer number (54930141).

Almost surely, 2^623221220 is an apocalyptic number.

It is an amenable number.

623221220 is an abundant number, since it is smaller than the sum of its proper divisors (695102164).

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

623221220 is a wasteful number, since it uses less digits than its factorization.

623221220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227599 (or 227597 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 623221220 is about 24964.3990514492. The cubic root of 623221220 is about 854.1760903607.

Adding to 623221220 its reverse (22122326), we get a palindrome (645343546).

The spelling of 623221220 in words is "six hundred twenty-three million, two hundred twenty-one thousand, two hundred twenty".