77000641 has 2 divisors, whose sum is σ = 77000642. Its totient is φ = 77000640.

The previous prime is 77000639. The next prime is 77000647. The reversal of 77000641 is 14600077.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77000625 + 16 = 8775^2 + 4^2 .

It is an emirp because it is prime and its reverse (14600077) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77000641 - 2¹ = 77000639 is a prime.

Together with 77000639, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (77000647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38500320 + 38500321.

It is an arithmetic number, because the mean of its divisors is an integer number (38500321).

Almost surely, 2^77000641 is an apocalyptic number.

It is an amenable number.

77000641 is a deficient number, since it is larger than the sum of its proper divisors (1).

77000641 is an equidigital number, since it uses as much as digits as its factorization.

77000641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1176, while the sum is 25.

The square root of 77000641 is about 8775.0009116809. Note that the first 3 decimals coincide. The cubic root of 77000641 is about 425.4332670362.

The spelling of 77000641 in words is "seventy-seven million, six hundred forty-one", and thus it is an aban number.