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27801045 = 325617801
BaseRepresentation
bin110101000001…
…1010111010101
31221022102212100
41222003113111
524104113140
62431512313
7455206416
oct152032725
957272770
1027801045
1114769378
129388699
1359b512c
14399980d
152692530
hex1a835d5

27801045 has 12 divisors (see below), whose sum is σ = 48188556. Its totient is φ = 14827200.

The previous prime is 27801041. The next prime is 27801049. The reversal of 27801045 is 54010872.

It is an interprime number because it is at equal distance from previous prime (27801041) and next prime (27801049).

It can be written as a sum of positive squares in 2 ways, for example, as 18326961 + 9474084 = 4281^2 + 3078^2 .

It is not a de Polignac number, because 27801045 - 22 = 27801041 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27801041) 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 11 ways as a sum of consecutive naturals, for example, 308856 + ... + 308945.

It is an arithmetic number, because the mean of its divisors is an integer number (4015713).

Almost surely, 227801045 is an apocalyptic number.

It is an amenable number.

27801045 is a deficient number, since it is larger than the sum of its proper divisors (20387511).

27801045 is a wasteful number, since it uses less digits than its factorization.

27801045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 617812 (or 617809 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 27801045 is about 5272.6696274278. The cubic root of 27801045 is about 302.9379672376.

The spelling of 27801045 in words is "twenty-seven million, eight hundred one thousand, forty-five".

Divisors: 1 3 5 9 15 45 617801 1853403 3089005 5560209 9267015 27801045