2178624340 has 12 divisors (see below), whose sum is σ = 4575111156. Its totient is φ = 871449728.

The previous prime is 2178624319. The next prime is 2178624347. The reversal of 2178624340 is 434268712.

It can be written as a sum of positive squares in 2 ways, for example, as 1652747716 + 525876624 = 40654^2 + 22932^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2178624340.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2178624347) 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, 54465589 + ... + 54465628.

It is an arithmetic number, because the mean of its divisors is an integer number (381259263).

Almost surely, 2^2178624340 is an apocalyptic number.

2178624340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2178624340 is an abundant number, since it is smaller than the sum of its proper divisors (2396486816).

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

2178624340 is a wasteful number, since it uses less digits than its factorization.

2178624340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108931226 (or 108931224 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 37.

The square root of 2178624340 is about 46675.7360948920. The cubic root of 2178624340 is about 1296.3654574762.

The spelling of 2178624340 in words is "two billion, one hundred seventy-eight million, six hundred twenty-four thousand, three hundred forty".