2789724650778 has 32 divisors (see below), whose sum is σ = 6676264123200. Its totient is φ = 858376815408.

The previous prime is 2789724650771. The next prime is 2789724650789. The reversal of 2789724650778 is 8770564279872.

It is a happy number.

2789724650778 is a `hidden beast` number, since 2 + 7 + 8 + 9 + 7 + 2 + 46 + 507 + 78 = 666.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2789724650771) 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, 1986982668 + ... + 1986984071.

It is an arithmetic number, because the mean of its divisors is an integer number (208633253850).

Almost surely, 2^{2789724650778} is an apocalyptic number.

2789724650778 is an abundant number, since it is smaller than the sum of its proper divisors (3886539472422).

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

2789724650778 is a wasteful number, since it uses less digits than its factorization.

2789724650778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3973966763 (or 3973966757 counting only the distinct ones).

The product of its (nonzero) digits is 663828480, while the sum is 72.

The spelling of 2789724650778 in words is "two trillion, seven hundred eighty-nine billion, seven hundred twenty-four million, six hundred fifty thousand, seven hundred seventy-eight".