2628803981 has 2 divisors, whose sum is σ = 2628803982. Its totient is φ = 2628803980.

The previous prime is 2628803963. The next prime is 2628804019. The reversal of 2628803981 is 1893088262.

2628803981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2293547881 + 335256100 = 47891^2 + 18310^2 .

It is a cyclic number.

It is not a de Polignac number, because 2628803981 - 2⁶ = 2628803917 is a prime.

It is a super-2 number, since 2×2628803981² = 13821220741042896722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2628803951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1314401990 + 1314401991.

It is an arithmetic number, because the mean of its divisors is an integer number (1314401991).

Almost surely, 2^2628803981 is an apocalyptic number.

It is an amenable number.

2628803981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2628803981 is an equidigital number, since it uses as much as digits as its factorization.

2628803981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 331776, while the sum is 47.

The square root of 2628803981 is about 51271.8634438032. The cubic root of 2628803981 is about 1380.1281091249.

The spelling of 2628803981 in words is "two billion, six hundred twenty-eight million, eight hundred three thousand, nine hundred eighty-one".