77332681 has 2 divisors, whose sum is σ = 77332682. Its totient is φ = 77332680.

The previous prime is 77332669. The next prime is 77332699. The reversal of 77332681 is 18623377.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56025225 + 21307456 = 7485^2 + 4616^2 .

It is an emirp because it is prime and its reverse (18623377) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77332681 - 2⁵ = 77332649 is a prime.

It is a super-2 number, since 2×77332681² = 11960687101295522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 77332681.

It is not a weakly prime, because it can be changed into another prime (77332621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38666340 + 38666341.

It is an arithmetic number, because the mean of its divisors is an integer number (38666341).

Almost surely, 2^77332681 is an apocalyptic number.

It is an amenable number.

77332681 is a deficient number, since it is larger than the sum of its proper divisors (1).

77332681 is an equidigital number, since it uses as much as digits as its factorization.

77332681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 42336, while the sum is 37.

The square root of 77332681 is about 8793.9002154903. The cubic root of 77332681 is about 426.0439039441.

The spelling of 77332681 in words is "seventy-seven million, three hundred thirty-two thousand, six hundred eighty-one".