28377621441 has 12 divisors (see below), whose sum is σ = 44142966868. Its totient is φ = 17463151584.

The previous prime is 28377621403. The next prime is 28377621457. The reversal of 28377621441 is 14412677382.

28377621441 is a `hidden beast` number, since 2 + 83 + 77 + 62 + 1 + 441 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 5516181441 + 22861440000 = 74271^2 + 151200^2 .

It is not a de Polignac number, because 28377621441 - 2¹⁷ = 28377490369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28377623441) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 121271770 + ... + 121272003.

Almost surely, 2^28377621441 is an apocalyptic number.

It is an amenable number.

28377621441 is a deficient number, since it is larger than the sum of its proper divisors (15765345427).

28377621441 is a wasteful number, since it uses less digits than its factorization.

28377621441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242543792 (or 242543789 counting only the distinct ones).

The product of its digits is 451584, while the sum is 45.

The spelling of 28377621441 in words is "twenty-eight billion, three hundred seventy-seven million, six hundred twenty-one thousand, four hundred forty-one".