2788128650 has 12 divisors (see below), whose sum is σ = 5185919382. Its totient is φ = 1115251440.

The previous prime is 2788128641. The next prime is 2788128661. The reversal of 2788128650 is 568218872.

It can be written as a sum of positive squares in 3 ways, for example, as 2119957849 + 668170801 = 46043^2 + 25849^2 .

It is a super-2 number, since 2×2788128650² = 15547322737901645000, which contains 22 as substring.

It is a hoax number, since the sum of its digits (47) 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 = 2788128595 and 2788128604.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27881237 + ... + 27881336.

Almost surely, 2^2788128650 is an apocalyptic number.

2788128650 is a deficient number, since it is larger than the sum of its proper divisors (2397790732).

2788128650 is a wasteful number, since it uses less digits than its factorization.

2788128650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55762585 (or 55762580 counting only the distinct ones).

The product of its (nonzero) digits is 430080, while the sum is 47.

The square root of 2788128650 is about 52802.7333572799. The cubic root of 2788128650 is about 1407.4649972839.

The spelling of 2788128650 in words is "two billion, seven hundred eighty-eight million, one hundred twenty-eight thousand, six hundred fifty".