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28988089 = 132229853
BaseRepresentation
bin110111010010…
…1001010111001
32000112202011221
41232211022321
524410104324
62513152041
7501252244
oct156451271
960482157
1028988089
11153aa1a9
12985b621
13600c520
143bc825b
1528290e4
hex1ba52b9

28988089 has 4 divisors (see below), whose sum is σ = 31217956. Its totient is φ = 26758224.

The previous prime is 28988039. The next prime is 28988117. The reversal of 28988089 is 98088982.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16064064 + 12924025 = 4008^2 + 3595^2 .

It is a cyclic number.

It is not a de Polignac number, because 28988089 - 27 = 28987961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28988039) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1114914 + ... + 1114939.

It is an arithmetic number, because the mean of its divisors is an integer number (7804489).

Almost surely, 228988089 is an apocalyptic number.

It is an amenable number.

28988089 is a deficient number, since it is larger than the sum of its proper divisors (2229867).

28988089 is a wasteful number, since it uses less digits than its factorization.

28988089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2229866.

The product of its (nonzero) digits is 663552, while the sum is 52.

The square root of 28988089 is about 5384.0587849688. The cubic root of 28988089 is about 307.1896143193.

The spelling of 28988089 in words is "twenty-eight million, nine hundred eighty-eight thousand, eighty-nine".

Divisors: 1 13 2229853 28988089