2780206078 has 32 divisors (see below), whose sum is σ = 4815538560. Its totient is φ = 1192389120.

The previous prime is 2780206069. The next prime is 2780206127. The reversal of 2780206078 is 8706020872.

It is a super-2 number, since 2×2780206078² = 15459091672296284168, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2780206078.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4893 + ... + 74728.

It is an arithmetic number, because the mean of its divisors is an integer number (150485580).

Almost surely, 2^2780206078 is an apocalyptic number.

2780206078 is a deficient number, since it is larger than the sum of its proper divisors (2035332482).

2780206078 is a wasteful number, since it uses less digits than its factorization.

2780206078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79732.

The product of its (nonzero) digits is 75264, while the sum is 40.

The square root of 2780206078 is about 52727.6595156660. The cubic root of 2780206078 is about 1406.1306110778.

The spelling of 2780206078 in words is "two billion, seven hundred eighty million, two hundred six thousand, seventy-eight".