1212516864 has 300 divisors, whose sum is σ = 3941498286. Its totient is φ = 370925568.

The previous prime is 1212516859. The next prime is 1212516931. The reversal of 1212516864 is 4686152121.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 888516864 + 324000000 = 29808^2 + 18000^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 7008682 + ... + 7008854.

Almost surely, 2^1212516864 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 1212516864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1970749143).

1212516864 is an abundant number, since it is smaller than the sum of its proper divisors (2728981422).

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

1212516864 is an equidigital number, since it uses as much as digits as its factorization.

1212516864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229 (or 191 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 1212516864 is about 34821.2128450460. The cubic root of 1212516864 is about 1066.3405614232.

Adding to 1212516864 its reverse (4686152121), we get a palindrome (5898668985).

The spelling of 1212516864 in words is "one billion, two hundred twelve million, five hundred sixteen thousand, eight hundred sixty-four".