Search a number
-
+
87639 = 3131223
BaseRepresentation
bin10101011001010111
311110012220
4111121113
510301024
61513423
7513336
oct253127
9143186
1087639
115a932
1242873
1330b76
1423d1d
151ae79
hex15657

87639 has 8 divisors (see below), whose sum is σ = 118272. Its totient is φ = 57720.

The previous prime is 87631. The next prime is 87641. The reversal of 87639 is 93678.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 87639 - 23 = 87631 is a prime.

87639 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 282 + ... + 504.

It is an arithmetic number, because the mean of its divisors is an integer number (14784).

287639 is an apocalyptic number.

87639 is a deficient number, since it is larger than the sum of its proper divisors (30633).

87639 is a wasteful number, since it uses less digits than its factorization.

87639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357.

The product of its digits is 9072, while the sum is 33.

The square root of 87639 is about 296.0388488020. The cubic root of 87639 is about 44.4186959654.

The spelling of 87639 in words is "eighty-seven thousand, six hundred thirty-nine".

Divisors: 1 3 131 223 393 669 29213 87639