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76661 = 135897
BaseRepresentation
bin10010101101110101
310220011022
4102231311
54423121
61350525
7436334
oct225565
9126138
1076661
1152662
1238445
1328b80
141dd1b
1517aab
hex12b75

76661 has 4 divisors (see below), whose sum is σ = 82572. Its totient is φ = 70752.

The previous prime is 76651. The next prime is 76667. The reversal of 76661 is 16667.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16667 = 72381.

It can be written as a sum of positive squares in 2 ways, for example, as 42436 + 34225 = 206^2 + 185^2 .

It is a cyclic number.

It is not a de Polignac number, because 76661 - 26 = 76597 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 76661.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 76661.

It is not an unprimeable number, because it can be changed into a prime (76667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2936 + ... + 2961.

It is an arithmetic number, because the mean of its divisors is an integer number (20643).

276661 is an apocalyptic number.

It is an amenable number.

76661 is a deficient number, since it is larger than the sum of its proper divisors (5911).

76661 is a wasteful number, since it uses less digits than its factorization.

76661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5910.

The product of its digits is 1512, while the sum is 26.

The square root of 76661 is about 276.8772291107. The cubic root of 76661 is about 42.4806832632.

It can be divided in two parts, 7666 and 1, that added together give a palindrome (7667).

The spelling of 76661 in words is "seventy-six thousand, six hundred sixty-one".

Divisors: 1 13 5897 76661