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63989 = 611049
BaseRepresentation
bin1111100111110101
310020202222
433213311
54021424
61212125
7354362
oct174765
9106688
1063989
1144092
1231045
1323183
1419469
1513e5e
hexf9f5

63989 has 4 divisors (see below), whose sum is σ = 65100. Its totient is φ = 62880.

The previous prime is 63977. The next prime is 63997. The reversal of 63989 is 98936.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 27889 + 36100 = 167^2 + 190^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-63989 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 464 + ... + 585.

It is an arithmetic number, because the mean of its divisors is an integer number (16275).

263989 is an apocalyptic number.

It is an amenable number.

63989 is a deficient number, since it is larger than the sum of its proper divisors (1111).

63989 is a wasteful number, since it uses less digits than its factorization.

63989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1110.

The product of its digits is 11664, while the sum is 35.

The square root of 63989 is about 252.9604712203. The cubic root of 63989 is about 39.9977082020.

Subtracting from 63989 its product of digits (11664), we obtain a palindrome (52325).

The spelling of 63989 in words is "sixty-three thousand, nine hundred eighty-nine".

Divisors: 1 61 1049 63989