2187732978 has 48 divisors (see below), whose sum is σ = 4795068096. Its totient is φ = 720813600.

The previous prime is 2187732931. The next prime is 2187732991. The reversal of 2187732978 is 8792377812.

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, 1680928 + ... + 1682228.

It is an arithmetic number, because the mean of its divisors is an integer number (99897252).

Almost surely, 2^2187732978 is an apocalyptic number.

2187732978 is an abundant number, since it is smaller than the sum of its proper divisors (2607335118).

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

2187732978 is a wasteful number, since it uses less digits than its factorization.

2187732978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2319 (or 2316 counting only the distinct ones).

The product of its digits is 2370816, while the sum is 54.

The square root of 2187732978 is about 46773.2079079466. The cubic root of 2187732978 is about 1298.1696090417.

The spelling of 2187732978 in words is "two billion, one hundred eighty-seven million, seven hundred thirty-two thousand, nine hundred seventy-eight".