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81436 = 2220359
BaseRepresentation
bin10011111000011100
311010201011
4103320130
510101221
61425004
7456265
oct237034
9133634
1081436
1156203
123b164
132b0b4
142196c
15191e1
hex13e1c

81436 has 6 divisors (see below), whose sum is σ = 142520. Its totient is φ = 40716.

The previous prime is 81421. The next prime is 81439. The reversal of 81436 is 63418.

81436 is nontrivially palindromic in base 3.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10176 + ... + 10183.

281436 is an apocalyptic number.

It is an amenable number.

81436 is a deficient number, since it is larger than the sum of its proper divisors (61084).

81436 is a wasteful number, since it uses less digits than its factorization.

81436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20363 (or 20361 counting only the distinct ones).

The product of its digits is 576, while the sum is 22.

The square root of 81436 is about 285.3699353471. The cubic root of 81436 is about 43.3449804327.

It can be divided in two parts, 8 and 1436, that added together give a square (1444 = 382).

The spelling of 81436 in words is "eighty-one thousand, four hundred thirty-six".

Divisors: 1 2 4 20359 40718 81436