2780500028 has 12 divisors (see below), whose sum is σ = 4868910480. Its totient is φ = 1389382752.

The previous prime is 2780499971. The next prime is 2780500039. The reversal of 2780500028 is 8200050872.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 2780499967 and 2780500003.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 209576 + ... + 222447.

It is an arithmetic number, because the mean of its divisors is an integer number (405742540).

Almost surely, 2^2780500028 is an apocalyptic number.

It is an amenable number.

2780500028 is a deficient number, since it is larger than the sum of its proper divisors (2088410452).

2780500028 is a wasteful number, since it uses less digits than its factorization.

2780500028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433636 (or 433634 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 32.

The square root of 2780500028 is about 52730.4468784402. The cubic root of 2780500028 is about 1406.1801658608.

The spelling of 2780500028 in words is "two billion, seven hundred eighty million, five hundred thousand, twenty-eight".