2640179778 has 32 divisors (see below), whose sum is σ = 5471746560. Its totient is φ = 848265600.

The previous prime is 2640179777. The next prime is 2640179783. The reversal of 2640179778 is 8779710462.

It is a self number, because there is not a number n which added to its sum of digits gives 2640179778.

It is not an unprimeable number, because it can be changed into a prime (2640179777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 91951 + ... + 117197.

It is an arithmetic number, because the mean of its divisors is an integer number (170992080).

Almost surely, 2^2640179778 is an apocalyptic number.

2640179778 is an abundant number, since it is smaller than the sum of its proper divisors (2831566782).

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

2640179778 is a wasteful number, since it uses less digits than its factorization.

2640179778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25882.

The product of its (nonzero) digits is 1185408, while the sum is 51.

The square root of 2640179778 is about 51382.6797471677. The cubic root of 2640179778 is about 1382.1160175646.

The spelling of 2640179778 in words is "two billion, six hundred forty million, one hundred seventy-nine thousand, seven hundred seventy-eight".