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30718 = 215359
BaseRepresentation
bin111011111111110
31120010201
413133332
51440333
6354114
7155362
oct73776
946121
1030718
1121096
121593a
1310c9c
14b2a2
15917d
hex77fe

30718 has 4 divisors (see below), whose sum is σ = 46080. Its totient is φ = 15358.

The previous prime is 30713. The next prime is 30727. The reversal of 30718 is 81703.

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

It is a junction number, because it is equal to n+sod(n) for n = 30695 and 30704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30713) by changing a digit.

30718 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7678 + ... + 7681.

It is an arithmetic number, because the mean of its divisors is an integer number (11520).

230718 is an apocalyptic number.

30718 is a deficient number, since it is larger than the sum of its proper divisors (15362).

30718 is a wasteful number, since it uses less digits than its factorization.

30718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15361.

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 30718 is about 175.2655128655. The cubic root of 30718 is about 31.3182614501.

It can be divided in two parts, 307 and 18, that added together give a triangular number (325 = T25).

The spelling of 30718 in words is "thirty thousand, seven hundred eighteen".

Divisors: 1 2 15359 30718