76868581 has 2 divisors, whose sum is σ = 76868582. Its totient is φ = 76868580.

The previous prime is 76868579. The next prime is 76868657. The reversal of 76868581 is 18586867.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44435556 + 32433025 = 6666^2 + 5695^2 .

It is a cyclic number.

It is not a de Polignac number, because 76868581 - 2¹ = 76868579 is a prime.

It is a super-2 number, since 2×76868581² = 11817557489907122, which contains 22 as substring.

Together with 76868579, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (76868521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38434290 + 38434291.

It is an arithmetic number, because the mean of its divisors is an integer number (38434291).

Almost surely, 2^76868581 is an apocalyptic number.

It is an amenable number.

76868581 is a deficient number, since it is larger than the sum of its proper divisors (1).

76868581 is an equidigital number, since it uses as much as digits as its factorization.

76868581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 645120, while the sum is 49.

The square root of 76868581 is about 8767.4728970211. The cubic root of 76868581 is about 425.1899146611.

The spelling of 76868581 in words is "seventy-six million, eight hundred sixty-eight thousand, five hundred eighty-one".