2145782678 has 16 divisors (see below), whose sum is σ = 3469964400. Its totient is φ = 989304096.

The previous prime is 2145782671. The next prime is 2145782713. The reversal of 2145782678 is 8762875412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145782671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18953 + ... + 68196.

It is an arithmetic number, because the mean of its divisors is an integer number (216872775).

Almost surely, 2^2145782678 is an apocalyptic number.

2145782678 is a deficient number, since it is larger than the sum of its proper divisors (1324181722).

2145782678 is a wasteful number, since it uses less digits than its factorization.

2145782678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88111.

The product of its digits is 1505280, while the sum is 50.

The square root of 2145782678 is about 46322.5936018267. The cubic root of 2145782678 is about 1289.8184304673.

The spelling of 2145782678 in words is "two billion, one hundred forty-five million, seven hundred eighty-two thousand, six hundred seventy-eight".