2628123981 has 8 divisors (see below), whose sum is σ = 4004760384. Its totient is φ = 1501785120.

The previous prime is 2628123941. The next prime is 2628123991. The reversal of 2628123981 is 1893218262.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2628123981 - 2⁹ = 2628123469 is a prime.

It is a super-2 number, since 2×2628123981² = 13814071319014576722, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2628123941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62574360 + ... + 62574401.

It is an arithmetic number, because the mean of its divisors is an integer number (500595048).

Almost surely, 2^2628123981 is an apocalyptic number.

2628123981 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2628123981 is a deficient number, since it is larger than the sum of its proper divisors (1376636403).

2628123981 is a wasteful number, since it uses less digits than its factorization.

2628123981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125148771.

The product of its digits is 82944, while the sum is 42.

The square root of 2628123981 is about 51265.2316975160. The cubic root of 2628123981 is about 1380.0090983437.

The spelling of 2628123981 in words is "two billion, six hundred twenty-eight million, one hundred twenty-three thousand, nine hundred eighty-one".