76840681 has 4 divisors (see below), whose sum is σ = 77159764. Its totient is φ = 76521600.

The previous prime is 76840679. The next prime is 76840703. The reversal of 76840681 is 18604867.

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

It can be written as a sum of positive squares in 2 ways, for example, as 62552281 + 14288400 = 7909^2 + 3780^2 .

It is a cyclic number.

It is not a de Polignac number, because 76840681 - 2¹ = 76840679 is a prime.

It is a super-2 number, since 2×76840681² = 11808980513087522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (76844681) 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, 159180 + ... + 159661.

It is an arithmetic number, because the mean of its divisors is an integer number (19289941).

Almost surely, 2^76840681 is an apocalyptic number.

It is an amenable number.

76840681 is a deficient number, since it is larger than the sum of its proper divisors (319083).

76840681 is a wasteful number, since it uses less digits than its factorization.

76840681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319082.

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 76840681 is about 8765.8816441930. The cubic root of 76840681 is about 425.1384665316.

The spelling of 76840681 in words is "seventy-six million, eight hundred forty thousand, six hundred eighty-one".