2208929778 has 168 divisors, whose sum is σ = 5756612400. Its totient is φ = 633180240.

The previous prime is 2208929761. The next prime is 2208929783. The reversal of 2208929778 is 8779298022.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 83 ways as a sum of consecutive naturals, for example, 3351613 + ... + 3352271.

It is an arithmetic number, because the mean of its divisors is an integer number (34265550).

Almost surely, 2^2208929778 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2208929778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2878306200).

2208929778 is an abundant number, since it is smaller than the sum of its proper divisors (3547682622).

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

2208929778 is a wasteful number, since it uses less digits than its factorization.

2208929778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 720 (or 694 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 54.

The square root of 2208929778 is about 46999.2529515098. The cubic root of 2208929778 is about 1302.3487672353.

The spelling of 2208929778 in words is "two billion, two hundred eight million, nine hundred twenty-nine thousand, seven hundred seventy-eight".