77868581 has 8 divisors (see below), whose sum is σ = 89207424. Its totient is φ = 66583440.

The previous prime is 77868569. The next prime is 77868587. The reversal of 77868581 is 18586877.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 77868581 - 2¹⁸ = 77606437 is a prime.

It is a super-2 number, since 2×77868581² = 12127031813907122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77868587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10265 + ... + 16158.

It is an arithmetic number, because the mean of its divisors is an integer number (11150928).

Almost surely, 2^77868581 is an apocalyptic number.

It is an amenable number.

77868581 is a deficient number, since it is larger than the sum of its proper divisors (11338843).

77868581 is a wasteful number, since it uses less digits than its factorization.

77868581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26851.

The product of its digits is 752640, while the sum is 50.

The square root of 77868581 is about 8824.3175940126. The cubic root of 77868581 is about 427.0257723659.

The spelling of 77868581 in words is "seventy-seven million, eight hundred sixty-eight thousand, five hundred eighty-one".