1222539648 has 128 divisors (see below), whose sum is σ = 3729283200. Its totient is φ = 350945280.

The previous prime is 1222539623. The next prime is 1222539679. The reversal of 1222539648 is 8469352221.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72640 + ... + 87872.

It is an arithmetic number, because the mean of its divisors is an integer number (29135025).

Almost surely, 2^1222539648 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 1222539648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1864641600).

1222539648 is an abundant number, since it is smaller than the sum of its proper divisors (2506743552).

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

1222539648 is a wasteful number, since it uses less digits than its factorization.

1222539648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15280 (or 15268 counting only the distinct ones).

The product of its digits is 207360, while the sum is 42.

The square root of 1222539648 is about 34964.8344483425. The cubic root of 1222539648 is about 1069.2706614486.

The spelling of 1222539648 in words is "one billion, two hundred twenty-two million, five hundred thirty-nine thousand, six hundred forty-eight".