2188640982 has 72 divisors (see below), whose sum is σ = 4973190264. Its totient is φ = 641625600.

The previous prime is 2188640957. The next prime is 2188640999. The reversal of 2188640982 is 2890468812.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 696118 + ... + 699254.

It is an arithmetic number, because the mean of its divisors is an integer number (69072087).

Almost surely, 2^2188640982 is an apocalyptic number.

2188640982 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 2188640982, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2486595132).

2188640982 is an abundant number, since it is smaller than the sum of its proper divisors (2784549282).

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

2188640982 is a wasteful number, since it uses less digits than its factorization.

2188640982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3226 (or 3184 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 48.

The square root of 2188640982 is about 46782.9133551984. The cubic root of 2188640982 is about 1298.3491830833.

The spelling of 2188640982 in words is "two billion, one hundred eighty-eight million, six hundred forty thousand, nine hundred eighty-two".