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28394445 = 357325931
BaseRepresentation
bin110110001010…
…0001111001101
31222102120212010
41230110033031
524232110240
62452331433
7463230432
oct154241715
958376763
1028394445
1115034192
129613b79
135b62261
143ab1b89
15275d280
hex1b143cd

28394445 has 16 divisors (see below), whose sum is σ = 46055232. Its totient is φ = 14935680.

The previous prime is 28394441. The next prime is 28394447. The reversal of 28394445 is 54449382.

It is not a de Polignac number, because 28394445 - 22 = 28394441 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28394441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11871 + ... + 14060.

It is an arithmetic number, because the mean of its divisors is an integer number (2878452).

Almost surely, 228394445 is an apocalyptic number.

It is an amenable number.

28394445 is a deficient number, since it is larger than the sum of its proper divisors (17660787).

28394445 is a wasteful number, since it uses less digits than its factorization.

28394445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26012.

The product of its digits is 138240, while the sum is 39.

The square root of 28394445 is about 5328.6438237135. The cubic root of 28394445 is about 305.0781668327.

The spelling of 28394445 in words is "twenty-eight million, three hundred ninety-four thousand, four hundred forty-five".

Divisors: 1 3 5 15 73 219 365 1095 25931 77793 129655 388965 1892963 5678889 9464815 28394445