2188865280 has 216 divisors, whose sum is σ = 8132724432. Its totient is φ = 500269056.

The previous prime is 2188865251. The next prime is 2188865309. The reversal of 2188865280 is 825688812.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2188865251) and next prime (2188865309).

It is a super-2 number, since 2×2188865280² = 9582262427978956800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 182344 + ... + 193976.

It is an arithmetic number, because the mean of its divisors is an integer number (37651502).

Almost surely, 2^2188865280 is an apocalyptic number.

2188865280 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 2188865280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4066362216).

2188865280 is an abundant number, since it is smaller than the sum of its proper divisors (5943859152).

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

2188865280 is a wasteful number, since it uses less digits than its factorization.

2188865280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11671 (or 11650 counting only the distinct ones).

The product of its (nonzero) digits is 491520, while the sum is 48.

The square root of 2188865280 is about 46785.3105151606. The cubic root of 2188865280 is about 1298.3935343771.

The spelling of 2188865280 in words is "two billion, one hundred eighty-eight million, eight hundred sixty-five thousand, two hundred eighty".