Search a number
-
+
87428 = 22111987
BaseRepresentation
bin10101010110000100
311102221002
4111112010
510244203
61512432
7512615
oct252604
9142832
1087428
115a760
1242718
1330a43
1423c0c
151ad88
hex15584

87428 has 12 divisors (see below), whose sum is σ = 166992. Its totient is φ = 39720.

The previous prime is 87427. The next prime is 87433. The reversal of 87428 is 82478.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 87428.

It is not an unprimeable number, because it can be changed into a prime (87421) by changing a digit.

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, 950 + ... + 1037.

It is an arithmetic number, because the mean of its divisors is an integer number (13916).

287428 is an apocalyptic number.

It is an amenable number.

87428 is a deficient number, since it is larger than the sum of its proper divisors (79564).

87428 is a wasteful number, since it uses less digits than its factorization.

87428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2002 (or 2000 counting only the distinct ones).

The product of its digits is 3584, while the sum is 29.

The square root of 87428 is about 295.6822618961. The cubic root of 87428 is about 44.3830197765.

Subtracting from 87428 its reverse (82478), we obtain a triangular number (4950 = T99).

It can be divided in two parts, 87 and 428, that added together give a palindrome (515).

The spelling of 87428 in words is "eighty-seven thousand, four hundred twenty-eight".

Divisors: 1 2 4 11 22 44 1987 3974 7948 21857 43714 87428