28551198841 has 9 divisors (see below), whose sum is σ = 31384765839. Its totient is φ = 25953945600.

The previous prime is 28551198821. The next prime is 28551198853. The reversal of 28551198841 is 14889115582.

The square root of 28551198841 is 168971.

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., 21853413241 + 6697785600 = 147829^2 + 81840^2 .

It is not a de Polignac number, because 28551198841 - 2⁹ = 28551198329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28551198821) 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, 1851001 + ... + 1866361.

Almost surely, 2^28551198841 is an apocalyptic number.

28551198841 is the 168971-st square number.

28551198841 is the 84486-th centered octagonal number.

It is an amenable number.

28551198841 is a deficient number, since it is larger than the sum of its proper divisors (2833566998).

28551198841 is an frugal number, since it uses more digits than its factorization.

28551198841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30744 (or 15372 counting only the distinct ones).

The product of its digits is 921600, while the sum is 52.

The spelling of 28551198841 in words is "twenty-eight billion, five hundred fifty-one million, one hundred ninety-eight thousand, eight hundred forty-one".