2178361920 has 112 divisors (see below), whose sum is σ = 7904366208. Its totient is φ = 497909760.

The previous prime is 2178361903. The next prime is 2178361921. The reversal of 2178361920 is 291638712.

It is a tau number, because it is divible by the number of its divisors (112).

It is not an unprimeable number, because it can be changed into a prime (2178361921) 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, 155361 + ... + 168800.

Almost surely, 2^2178361920 is an apocalyptic number.

2178361920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2178361920 is an abundant number, since it is smaller than the sum of its proper divisors (5726004288).

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

2178361920 is a wasteful number, since it uses less digits than its factorization.

2178361920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324188 (or 324178 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 2178361920 is about 46672.9249137013. The cubic root of 2178361920 is about 1296.3134053812.

The spelling of 2178361920 in words is "two billion, one hundred seventy-eight million, three hundred sixty-one thousand, nine hundred twenty".