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28438889 is a prime number
BaseRepresentation
bin110110001111…
…1000101101001
31222111211211012
41230133011221
524240021024
62453313305
7463504133
oct154370551
958454735
1028438889
1115064616
129635835
135b7955b
143ac4053
15276b50e
hex1b1f169

28438889 has 2 divisors, whose sum is σ = 28438890. Its totient is φ = 28438888.

The previous prime is 28438853. The next prime is 28438897. The reversal of 28438889 is 98883482.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16933225 + 11505664 = 4115^2 + 3392^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-28438889 is a prime.

It is not a weakly prime, because it can be changed into another prime (28438489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14219444 + 14219445.

It is an arithmetic number, because the mean of its divisors is an integer number (14219445).

Almost surely, 228438889 is an apocalyptic number.

It is an amenable number.

28438889 is a deficient number, since it is larger than the sum of its proper divisors (1).

28438889 is an equidigital number, since it uses as much as digits as its factorization.

28438889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 884736, while the sum is 50.

The square root of 28438889 is about 5332.8124849839. The cubic root of 28438889 is about 305.2372569399.

The spelling of 28438889 in words is "twenty-eight million, four hundred thirty-eight thousand, eight hundred eighty-nine".