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BaseRepresentation
bin10010101110001001
310220012001
4102232021
54423211
61351001
7436363
oct225611
9126161
1076681
1152680
1238461
1328b97
141dd33
1517ac1
hex12b89

76681 has 4 divisors (see below), whose sum is σ = 83664. Its totient is φ = 69700.

The previous prime is 76679. The next prime is 76697. The reversal of 76681 is 18667.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18667 = 111697.

It is a cyclic number.

It is not a de Polignac number, because 76681 - 21 = 76679 is a prime.

It is a super-2 number, since 2×766812 = 11759951522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (76631) 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, 3475 + ... + 3496.

It is an arithmetic number, because the mean of its divisors is an integer number (20916).

276681 is an apocalyptic number.

It is an amenable number.

76681 is a deficient number, since it is larger than the sum of its proper divisors (6983).

76681 is a wasteful number, since it uses less digits than its factorization.

76681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6982.

The product of its digits is 2016, while the sum is 28.

The square root of 76681 is about 276.9133438460. The cubic root of 76681 is about 42.4843771875.

It can be divided in two parts, 76 and 681, that added together give a palindrome (757).

The spelling of 76681 in words is "seventy-six thousand, six hundred eighty-one".

Divisors: 1 11 6971 76681