2122778880 has 288 divisors, whose sum is σ = 7593868800. Its totient is φ = 561512448.

The previous prime is 2122778863. The next prime is 2122778897. The reversal of 2122778880 is 888772212.

It is an interprime number because it is at equal distance from previous prime (2122778863) and next prime (2122778897).

It is a tau number, because it is divible by the number of its divisors (288).

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 8259712 + ... + 8259968.

It is an arithmetic number, because the mean of its divisors is an integer number (26367600).

Almost surely, 2^2122778880 is an apocalyptic number.

2122778880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2122778880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3796934400).

2122778880 is an abundant number, since it is smaller than the sum of its proper divisors (5471089920).

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

2122778880 is a wasteful number, since it uses less digits than its factorization.

2122778880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 526 (or 506 counting only the distinct ones).

The product of its (nonzero) digits is 200704, while the sum is 45.

The square root of 2122778880 is about 46073.6245589600. The cubic root of 2122778880 is about 1285.1927078043.

The spelling of 2122778880 in words is "two billion, one hundred twenty-two million, seven hundred seventy-eight thousand, eight hundred eighty".