1228644238464 has 48 divisors (see below), whose sum is σ = 3535551783270. Its totient is φ = 409548079104.

The previous prime is 1228644238463. The next prime is 1228644238477. The reversal of 1228644238464 is 4648324468221.

1228644238464 is a `hidden beast` number, since 1 + 2 + 2 + 86 + 4 + 423 + 84 + 64 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1227043598400 + 1600640064 = 1107720^2 + 40008^2 .

It is a tau number, because it is divible by the number of its divisors (48).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 1228644238464.

It is not an unprimeable number, because it can be changed into a prime (1228644238463) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 533264577 + ... + 533266880.

Almost surely, 2^{1228644238464} is an apocalyptic number.

It is an amenable number.

1228644238464 is an abundant number, since it is smaller than the sum of its proper divisors (2306907544806).

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

1228644238464 is a wasteful number, since it uses less digits than its factorization.

1228644238464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1066531477 (or 1066531462 counting only the distinct ones).

The product of its digits is 14155776, while the sum is 54.

The spelling of 1228644238464 in words is "one trillion, two hundred twenty-eight billion, six hundred forty-four million, two hundred thirty-eight thousand, four hundred sixty-four".