28419561 has 9 divisors (see below), whose sum is σ = 41073591. Its totient is φ = 18935712.

The previous prime is 28419551. The next prime is 28419577. The reversal of 28419561 is 16591482.

The square root of 28419561 is 5331.

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

28419561 is a `hidden beast` number, since 2 + 84 + 19 + 561 = 666.

It can be written as a sum of positive squares in only one way, i.e., 14402025 + 14017536 = 3795^2 + 3744^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 28419561 - 2⁹ = 28419049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28419511) 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, 15105 + ... + 16881.

Almost surely, 2^28419561 is an apocalyptic number.

28419561 is the 5331-st square number.

28419561 is the 2666-th centered octagonal number.

It is an amenable number.

28419561 is a deficient number, since it is larger than the sum of its proper divisors (12654030).

28419561 is an frugal number, since it uses more digits than its factorization.

28419561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3560 (or 1780 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The cubic root of 28419561 is about 305.1680915243.

Multiplying 28419561 by its sum of digits (36), we get a square (1023104196 = 31986²).

The spelling of 28419561 in words is "twenty-eight million, four hundred nineteen thousand, five hundred sixty-one".