77530081 has 8 divisors (see below), whose sum is σ = 82692360. Its totient is φ = 72434688.

The previous prime is 77530073. The next prime is 77530093. The reversal of 77530081 is 18003577.

It can be written as a sum of positive squares in 4 ways, for example, as 5958481 + 71571600 = 2441^2 + 8460^2 .

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

It is not a de Polignac number, because 77530081 - 2³ = 77530073 is a prime.

It is a super-2 number, since 2×77530081² = 12021826919733122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77530031) 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 7 ways as a sum of consecutive naturals, for example, 14316 + ... + 18973.

It is an arithmetic number, because the mean of its divisors is an integer number (10336545).

Almost surely, 2^77530081 is an apocalyptic number.

It is an amenable number.

77530081 is a deficient number, since it is larger than the sum of its proper divisors (5162279).

77530081 is a wasteful number, since it uses less digits than its factorization.

77530081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33443.

The product of its (nonzero) digits is 5880, while the sum is 31.

The square root of 77530081 is about 8805.1167510715. The cubic root of 77530081 is about 426.4061035896.

The spelling of 77530081 in words is "seventy-seven million, five hundred thirty thousand, eighty-one".