2780825578 has 4 divisors (see below), whose sum is σ = 4171238370. Its totient is φ = 1390412788.

The previous prime is 2780825563. The next prime is 2780825587. The reversal of 2780825578 is 8755280872.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 2321023329 + 459802249 = 48177^2 + 21443^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 695206393 + ... + 695206396.

Almost surely, 2^2780825578 is an apocalyptic number.

2780825578 is a deficient number, since it is larger than the sum of its proper divisors (1390412792).

2780825578 is a wasteful number, since it uses less digits than its factorization.

2780825578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1390412791.

The product of its (nonzero) digits is 2508800, while the sum is 52.

The square root of 2780825578 is about 52733.5337143264. The cubic root of 2780825578 is about 1406.2350437705.

The spelling of 2780825578 in words is "two billion, seven hundred eighty million, eight hundred twenty-five thousand, five hundred seventy-eight".