2186650640 has 40 divisors (see below), whose sum is σ = 5090382528. Its totient is φ = 873555840.

The previous prime is 2186650639. The next prime is 2186650649. The reversal of 2186650640 is 460566812.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 2186650594 and 2186650603.

It is not an unprimeable number, because it can be changed into a prime (2186650649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48029 + ... + 81731.

Almost surely, 2^2186650640 is an apocalyptic number.

2186650640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2186650640 is an abundant number, since it is smaller than the sum of its proper divisors (2903731888).

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

2186650640 is a wasteful number, since it uses less digits than its factorization.

2186650640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34527 (or 34521 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 38.

The square root of 2186650640 is about 46761.6364127690. The cubic root of 2186650640 is about 1297.9554924067.

The spelling of 2186650640 in words is "two billion, one hundred eighty-six million, six hundred fifty thousand, six hundred forty".