77443643 has 2 divisors, whose sum is σ = 77443644. Its totient is φ = 77443642.

The previous prime is 77443637. The next prime is 77443651. The reversal of 77443643 is 34634477.

It is a weak prime.

It is an emirp because it is prime and its reverse (34634477) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77443643 - 2¹² = 77439547 is a prime.

It is a super-2 number, since 2×77443643² = 11995035682222898, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 77443597 and 77443606.

It is not a weakly prime, because it can be changed into another prime (77443603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38721821 + 38721822.

It is an arithmetic number, because the mean of its divisors is an integer number (38721822).

Almost surely, 2^77443643 is an apocalyptic number.

77443643 is a deficient number, since it is larger than the sum of its proper divisors (1).

77443643 is an equidigital number, since it uses as much as digits as its factorization.

77443643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 169344, while the sum is 38.

The square root of 77443643 is about 8800.2069862021. The cubic root of 77443643 is about 426.2475784671.

The spelling of 77443643 in words is "seventy-seven million, four hundred forty-three thousand, six hundred forty-three".