2019888864 has 144 divisors (see below), whose sum is σ = 6950911968. Its totient is φ = 543154176.

The previous prime is 2019888859. The next prime is 2019888887. The reversal of 2019888864 is 4688889102.

It is a tau number, because it is divible by the number of its divisors (144).

It is a super-2 number, since 2×2019888864² = 8159902045822420992, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2019888864.

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, 4804 + ... + 63740.

It is an arithmetic number, because the mean of its divisors is an integer number (48270222).

Almost surely, 2^2019888864 is an apocalyptic number.

2019888864 is a gapful number since it is divisible by the number (24) 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 2019888864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3475455984).

2019888864 is an abundant number, since it is smaller than the sum of its proper divisors (4931023104).

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

2019888864 is a wasteful number, since it uses less digits than its factorization.

2019888864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58977 (or 58966 counting only the distinct ones).

The product of its (nonzero) digits is 1769472, while the sum is 54.

The square root of 2019888864 is about 44943.1737197096. The cubic root of 2019888864 is about 1264.0836816360.

The spelling of 2019888864 in words is "two billion, nineteen million, eight hundred eighty-eight thousand, eight hundred sixty-four".