76681081 has 4 divisors (see below), whose sum is σ = 76723812. Its totient is φ = 76638352.

The previous prime is 76681063. The next prime is 76681091. The reversal of 76681081 is 18018667.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18018667 = 37 ⋅486991.

It can be written as a sum of positive squares in 2 ways, for example, as 66977856 + 9703225 = 8184^2 + 3115^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-76681081 is a prime.

It is a super-2 number, since 2×76681081² = 11759976366657122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 76681081.

It is not an unprimeable number, because it can be changed into a prime (76681001) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 18550 + ... + 22303.

It is an arithmetic number, because the mean of its divisors is an integer number (19180953).

Almost surely, 2^76681081 is an apocalyptic number.

It is an amenable number.

76681081 is a deficient number, since it is larger than the sum of its proper divisors (42731).

76681081 is a wasteful number, since it uses less digits than its factorization.

76681081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42730.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 76681081 is about 8756.7734354613. The cubic root of 76681081 is about 424.8439214656.

The spelling of 76681081 in words is "seventy-six million, six hundred eighty-one thousand, eighty-one".