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28264649 = 74037807
BaseRepresentation
bin110101111010…
…0100011001001
31222011222210212
41223310203021
524213432044
62445450505
7462150140
oct153644311
958158725
1028264649
1114a55716
129570a35
135b1815a
143a7a757
152734a9e
hex1af48c9

28264649 has 4 divisors (see below), whose sum is σ = 32302464. Its totient is φ = 24226836.

The previous prime is 28264619. The next prime is 28264661. The reversal of 28264649 is 94646282.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 94646282 = 247323141.

It is a cyclic number.

It is not a de Polignac number, because 28264649 - 28 = 28264393 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28264619) 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 3 ways as a sum of consecutive naturals, for example, 2018897 + ... + 2018910.

It is an arithmetic number, because the mean of its divisors is an integer number (8075616).

Almost surely, 228264649 is an apocalyptic number.

It is an amenable number.

28264649 is a deficient number, since it is larger than the sum of its proper divisors (4037815).

28264649 is an equidigital number, since it uses as much as digits as its factorization.

28264649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4037814.

The product of its digits is 165888, while the sum is 41.

The square root of 28264649 is about 5316.4507897657. The cubic root of 28264649 is about 304.6126014049.

The spelling of 28264649 in words is "twenty-eight million, two hundred sixty-four thousand, six hundred forty-nine".

Divisors: 1 7 4037807 28264649