1223020660 has 12 divisors (see below), whose sum is σ = 2568343428. Its totient is φ = 489208256.

The previous prime is 1223020639. The next prime is 1223020697. The reversal of 1223020660 is 660203221.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 264127504 + 958893156 = 16252^2 + 30966^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30575497 + ... + 30575536.

It is an arithmetic number, because the mean of its divisors is an integer number (214028619).

Almost surely, 2^1223020660 is an apocalyptic number.

1223020660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1223020660 is an abundant number, since it is smaller than the sum of its proper divisors (1345322768).

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

1223020660 is a wasteful number, since it uses less digits than its factorization.

1223020660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61151042 (or 61151040 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 1223020660 is about 34971.7122829295. The cubic root of 1223020660 is about 1069.4108790085.

Adding to 1223020660 its reverse (660203221), we get a palindrome (1883223881).

The spelling of 1223020660 in words is "one billion, two hundred twenty-three million, twenty thousand, six hundred sixty".