2259778878 has 128 divisors (see below), whose sum is σ = 5927040000. Its totient is φ = 624775680.

The previous prime is 2259778867. The next prime is 2259778879. The reversal of 2259778878 is 8788779522.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2259778879) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2153698 + ... + 2154746.

It is an arithmetic number, because the mean of its divisors is an integer number (46305000).

Almost surely, 2^2259778878 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2259778878, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2963520000).

2259778878 is an abundant number, since it is smaller than the sum of its proper divisors (3667261122).

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

2259778878 is a wasteful number, since it uses less digits than its factorization.

2259778878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1247 (or 1241 counting only the distinct ones).

The product of its digits is 31610880, while the sum is 63.

The square root of 2259778878 is about 47537.1315710151. The cubic root of 2259778878 is about 1312.2663172538.

It can be divided in two parts, 22597 and 78878, that added together give a triangular number (101475 = T₄₅₀).

The spelling of 2259778878 in words is "two billion, two hundred fifty-nine million, seven hundred seventy-eight thousand, eight hundred seventy-eight".