2208864578 has 18 divisors (see below), whose sum is σ = 3350089971. Its totient is φ = 1092302244.

The previous prime is 2208864577. The next prime is 2208864583. The reversal of 2208864578 is 8754688022.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1104432289 + 1104432289 = 33233^2 + 33233^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=33233.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2208864577) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 11099723 + ... + 11099921.

Almost surely, 2^2208864578 is an apocalyptic number.

2208864578 is a deficient number, since it is larger than the sum of its proper divisors (1141225393).

2208864578 is an frugal number, since it uses more digits than its factorization.

2208864578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 734 (or 368 counting only the distinct ones).

The product of its (nonzero) digits is 1720320, while the sum is 50.

The square root of 2208864578 is about 46998.5593183451. The cubic root of 2208864578 is about 1302.3359534924.

Multiplying 2208864578 by its sum of digits (50), we get a square (110443228900 = 332330²).

The spelling of 2208864578 in words is "two billion, two hundred eight million, eight hundred sixty-four thousand, five hundred seventy-eight".