77677889 has 2 divisors, whose sum is σ = 77677890. Its totient is φ = 77677888.

The previous prime is 77677883. The next prime is 77677927. The reversal of 77677889 is 98877677.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41473600 + 36204289 = 6440^2 + 6017^2 .

It is a cyclic number.

It is not a de Polignac number, because 77677889 - 2¹² = 77673793 is a prime.

It is not a weakly prime, because it can be changed into another prime (77677883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38838944 + 38838945.

It is an arithmetic number, because the mean of its divisors is an integer number (38838945).

Almost surely, 2^77677889 is an apocalyptic number.

It is an amenable number.

77677889 is a deficient number, since it is larger than the sum of its proper divisors (1).

77677889 is an equidigital number, since it uses as much as digits as its factorization.

77677889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8297856, while the sum is 59.

The square root of 77677889 is about 8813.5060560483. The cubic root of 77677889 is about 426.6769069672.

The spelling of 77677889 in words is "seventy-seven million, six hundred seventy-seven thousand, eight hundred eighty-nine".