28824646961881 has 9 divisors (see below), whose sum is σ = 29784640690623. Its totient is φ = 27894658574760.

The previous prime is 28824646961837. The next prime is 28824646961893. The reversal of 28824646961881 is 18816964642882.

It is a happy number.

The square root of 28824646961881 is 5368859.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 14600736430281 + 14223910531600 = 3821091^2 + 3771460^2 .

It is not a de Polignac number, because 28824646961881 - 2¹¹ = 28824646959833 is a prime.

It is a super-2 number, since 2×28824646961881² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28824646931881) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 166348035 + ... + 166521223.

Almost surely, 2^{28824646961881} is an apocalyptic number.

28824646961881 is the 5368859-th square number.

28824646961881 is the 2684430-th centered octagonal number.

It is an amenable number.

28824646961881 is a deficient number, since it is larger than the sum of its proper divisors (959993728742).

28824646961881 is an frugal number, since it uses more digits than its factorization.

28824646961881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346440 (or 173220 counting only the distinct ones).

The product of its digits is 509607936, while the sum is 73.

The spelling of 28824646961881 in words is "twenty-eight trillion, eight hundred twenty-four billion, six hundred forty-six million, nine hundred sixty-one thousand, eight hundred eighty-one".