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51988 = 2241317
BaseRepresentation
bin1100101100010100
32122022111
430230110
53130423
61040404
7304366
oct145424
978274
1051988
1136072
1226104
131a881
1414d36
151060d
hexcb14

51988 has 12 divisors (see below), whose sum is σ = 93492. Its totient is φ = 25280.

The previous prime is 51977. The next prime is 51991. The reversal of 51988 is 88915.

It can be written as a sum of positive squares in 2 ways, for example, as 2704 + 49284 = 52^2 + 222^2 .

It is a super-5 number, since 5×519885 (a number of 25 digits) contains 55555 as substring.

Its product of digits (2880) is a multiple of the sum of its prime divisors (360).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6 + ... + 322.

It is an arithmetic number, because the mean of its divisors is an integer number (7791).

251988 is an apocalyptic number.

It is an amenable number.

51988 is a deficient number, since it is larger than the sum of its proper divisors (41504).

51988 is a wasteful number, since it uses less digits than its factorization.

51988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362 (or 360 counting only the distinct ones).

The product of its digits is 2880, while the sum is 31.

The square root of 51988 is about 228.0087717611. The cubic root of 51988 is about 37.3222401849.

The spelling of 51988 in words is "fifty-one thousand, nine hundred eighty-eight".

Divisors: 1 2 4 41 82 164 317 634 1268 12997 25994 51988