28181477404225 has 12 divisors (see below), whose sum is σ = 34977180158464. Its totient is φ = 22524441163920.

The previous prime is 28181477404217. The next prime is 28181477404243. The reversal of 28181477404225 is 52240477418182.

It is a happy number.

It is not a de Polignac number, because 28181477404225 - 2³ = 28181477404217 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 518491269 + ... + 518545618.

Almost surely, 2^{28181477404225} is an apocalyptic number.

28181477404225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28181477404225 is a deficient number, since it is larger than the sum of its proper divisors (6795702754239).

28181477404225 is a wasteful number, since it uses less digits than its factorization.

28181477404225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1037037984 (or 1037037979 counting only the distinct ones).

The product of its (nonzero) digits is 8028160, while the sum is 55.

The spelling of 28181477404225 in words is "twenty-eight trillion, one hundred eighty-one billion, four hundred seventy-seven million, four hundred four thousand, two hundred twenty-five".