2181000678 has 32 divisors (see below), whose sum is σ = 4470339456. Its totient is φ = 708996288.

The previous prime is 2181000677. The next prime is 2181000707. The reversal of 2181000678 is 8760001812.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2181000673) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 170026 + ... + 182402.

It is an arithmetic number, because the mean of its divisors is an integer number (139698108).

Almost surely, 2^2181000678 is an apocalyptic number.

2181000678 is an abundant number, since it is smaller than the sum of its proper divisors (2289338778).

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

2181000678 is a wasteful number, since it uses less digits than its factorization.

2181000678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13108.

The product of its (nonzero) digits is 5376, while the sum is 33.

The square root of 2181000678 is about 46701.1849742595. The cubic root of 2181000678 is about 1296.8366237779.

The spelling of 2181000678 in words is "two billion, one hundred eighty-one million, six hundred seventy-eight", and thus it is an aban number.