28473561 has 12 divisors (see below), whose sum is σ = 41905188. Its totient is φ = 18623904.

The previous prime is 28473553. The next prime is 28473607. The reversal of 28473561 is 16537482.

28473561 is a `hidden beast` number, since 28 + 4 + 73 + 561 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 8088336 + 20385225 = 2844^2 + 4515^2 .

It is not a de Polignac number, because 28473561 - 2³ = 28473553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28473161) 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, 29370 + ... + 30323.

It is an arithmetic number, because the mean of its divisors is an integer number (3492099).

Almost surely, 2^28473561 is an apocalyptic number.

It is an amenable number.

28473561 is a deficient number, since it is larger than the sum of its proper divisors (13431627).

28473561 is a wasteful number, since it uses less digits than its factorization.

28473561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59752 (or 59749 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 28473561 is about 5336.0623122299. The cubic root of 28473561 is about 305.3612525030.

The spelling of 28473561 in words is "twenty-eight million, four hundred seventy-three thousand, five hundred sixty-one".