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28654609 = 5321012
BaseRepresentation
bin110110101001…
…1110000010001
31222220210201211
41231103300101
524313421414
62502100121
7465363064
oct155236021
958823654
1028654609
11151a16a5
12971a641
135c237b9
143b3c8db
1527b03c4
hex1b53c11

28654609 has 9 divisors (see below), whose sum is σ = 29497489. Its totient is φ = 27835600.

The previous prime is 28654601. The next prime is 28654657. The reversal of 28654609 is 90645682.

It is a happy number.

The square root of 28654609 is 5353.

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

It can be written as a sum of positive squares in 4 ways, for example, as 15171025 + 13483584 = 3895^2 + 3672^2 .

It is not a de Polignac number, because 28654609 - 23 = 28654601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28654601) 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, 283659 + ... + 283759.

Almost surely, 228654609 is an apocalyptic number.

28654609 is the 5353-rd square number.

28654609 is the 2677-th centered octagonal number.

It is an amenable number.

28654609 is a deficient number, since it is larger than the sum of its proper divisors (842880).

28654609 is an frugal number, since it uses more digits than its factorization.

28654609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308 (or 154 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 40.

The cubic root of 28654609 is about 306.0070946851.

The spelling of 28654609 in words is "twenty-eight million, six hundred fifty-four thousand, six hundred nine".