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87678789 = 3113771809
BaseRepresentation
bin1010011100111…
…01111101000101
320002222112200120
411032131331011
5134421210124
612411132153
72113154202
oct516357505
9202875616
1087678789
1145546410
1225444059
131521b553
14b904ca9
157a6dd79
hex539df45

87678789 has 16 divisors (see below), whose sum is σ = 130981440. Its totient is φ = 51701760.

The previous prime is 87678781. The next prime is 87678817. The reversal of 87678789 is 98787678.

87678789 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is not a de Polignac number, because 87678789 - 23 = 87678781 is a prime.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87678781) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34684 + ... + 37125.

It is an arithmetic number, because the mean of its divisors is an integer number (8186340).

Almost surely, 287678789 is an apocalyptic number.

It is an amenable number.

87678789 is a deficient number, since it is larger than the sum of its proper divisors (43302651).

87678789 is a wasteful number, since it uses less digits than its factorization.

87678789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71860.

The product of its digits is 9483264, while the sum is 60.

The square root of 87678789 is about 9363.6952641572. The cubic root of 87678789 is about 444.2541712867.

Subtracting 87678789 from its reverse (98787678), we obtain a square (11108889 = 33332).

It can be divided in two parts, 87 and 678789, that added together give a palindrome (678876).

The spelling of 87678789 in words is "eighty-seven million, six hundred seventy-eight thousand, seven hundred eighty-nine".

Divisors: 1 3 11 33 37 111 407 1221 71809 215427 789899 2369697 2656933 7970799 29226263 87678789