1212437664 has 36 divisors (see below), whose sum is σ = 3447870426. Its totient is φ = 404145792.

The previous prime is 1212437659. The next prime is 1212437687. The reversal of 1212437664 is 4667342121.

1212437664 is a `hidden beast` number, since 1 + 212 + 437 + 6 + 6 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 791859600 + 420578064 = 28140^2 + 20508^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

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 5 ways as a sum of consecutive naturals, for example, 2104639 + ... + 2105214.

Almost surely, 2^1212437664 is an apocalyptic number.

It is an amenable number.

1212437664 is an abundant number, since it is smaller than the sum of its proper divisors (2235432762).

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

1212437664 is a wasteful number, since it uses less digits than its factorization.

1212437664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4209869 (or 4209858 counting only the distinct ones).

The product of its digits is 48384, while the sum is 36.

The square root of 1212437664 is about 34820.0755886601. The cubic root of 1212437664 is about 1066.3173435987.

Adding to 1212437664 its reverse (4667342121), we get a palindrome (5879779785).

The spelling of 1212437664 in words is "one billion, two hundred twelve million, four hundred thirty-seven thousand, six hundred sixty-four".