2309504778 has 64 divisors (see below), whose sum is σ = 5895985920. Its totient is φ = 656418816.

The previous prime is 2309504767. The next prime is 2309504789. The reversal of 2309504778 is 8774059032.

It is an interprime number because it is at equal distance from previous prime (2309504767) and next prime (2309504789).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 57126 + ... + 88782.

It is an arithmetic number, because the mean of its divisors is an integer number (92124780).

Almost surely, 2^2309504778 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2309504778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2947992960).

2309504778 is an abundant number, since it is smaller than the sum of its proper divisors (3586481142).

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

2309504778 is a wasteful number, since it uses less digits than its factorization.

2309504778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31868 (or 31862 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 45.

The square root of 2309504778 is about 48057.3072279336. The cubic root of 2309504778 is about 1321.8219365853.

The spelling of 2309504778 in words is "two billion, three hundred nine million, five hundred four thousand, seven hundred seventy-eight".