1213228660 has 96 divisors (see below), whose sum is σ = 3136573440. Its totient is φ = 384870528.

The previous prime is 1213228651. The next prime is 1213228669. The reversal of 1213228660 is 668223121.

It is an interprime number because it is at equal distance from previous prime (1213228651) and next prime (1213228669).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213228669) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 109077 + ... + 119683.

It is an arithmetic number, because the mean of its divisors is an integer number (32672640).

Almost surely, 2^1213228660 is an apocalyptic number.

1213228660 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 1213228660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1568286720).

1213228660 is an abundant number, since it is smaller than the sum of its proper divisors (1923344780).

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

1213228660 is a wasteful number, since it uses less digits than its factorization.

1213228660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10685 (or 10683 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 1213228660 is about 34831.4320693250. The cubic root of 1213228660 is about 1066.5491821560.

The spelling of 1213228660 in words is "one billion, two hundred thirteen million, two hundred twenty-eight thousand, six hundred sixty".