2178180864 has 54 divisors (see below), whose sum is σ = 6280239056. Its totient is φ = 726059520.

The previous prime is 2178180859. The next prime is 2178180877. The reversal of 2178180864 is 4680818712.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 470392 + ... + 474999.

Almost surely, 2^2178180864 is an apocalyptic number.

2178180864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

2178180864 is an abundant number, since it is smaller than the sum of its proper divisors (4102058192).

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

2178180864 is an equidigital number, since it uses as much as digits as its factorization.

2178180864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 945413 (or 945396 counting only the distinct ones).

The product of its (nonzero) digits is 172032, while the sum is 45.

The square root of 2178180864 is about 46670.9852477961. The cubic root of 2178180864 is about 1296.2774897358.

The spelling of 2178180864 in words is "two billion, one hundred seventy-eight million, one hundred eighty thousand, eight hundred sixty-four".