1228312512 has 196 divisors, whose sum is σ = 4177655856. Its totient is φ = 350853120.

The previous prime is 1228312511. The next prime is 1228312639. The reversal of 1228312512 is 2152138221.

It is a super-3 number, since 3×1228312512³ (a number of 28 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1228312511) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 324712 + ... + 328472.

Almost surely, 2^1228312512 is an apocalyptic number.

1228312512 is a gapful number since it is divisible by the number (12) 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 1228312512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2088827928).

1228312512 is an abundant number, since it is smaller than the sum of its proper divisors (2949343344).

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

1228312512 is an frugal number, since it uses more digits than its factorization.

1228312512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3798 (or 3773 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 1228312512 is about 35047.2896526964. The cubic root of 1228312512 is about 1070.9510605418.

The spelling of 1228312512 in words is "one billion, two hundred twenty-eight million, three hundred twelve thousand, five hundred twelve".