2186878728 has 16 divisors (see below), whose sum is σ = 5467196880. Its totient is φ = 728959568.

The previous prime is 2186878723. The next prime is 2186878753. The reversal of 2186878728 is 8278786812.

It is not an unprimeable number, because it can be changed into a prime (2186878721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45559950 + ... + 45559997.

It is an arithmetic number, because the mean of its divisors is an integer number (341699805).

Almost surely, 2^2186878728 is an apocalyptic number.

It is an amenable number.

2186878728 is an abundant number, since it is smaller than the sum of its proper divisors (3280318152).

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

2186878728 is a wasteful number, since it uses less digits than its factorization.

2186878728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91119956 (or 91119952 counting only the distinct ones).

The product of its digits is 4816896, while the sum is 57.

The square root of 2186878728 is about 46764.0751859801. The cubic root of 2186878728 is about 1298.0006204477. Note that the first 3 decimals are identical.

The spelling of 2186878728 in words is "two billion, one hundred eighty-six million, eight hundred seventy-eight thousand, seven hundred twenty-eight".