77620489 has 2 divisors, whose sum is σ = 77620490. Its totient is φ = 77620488.

The previous prime is 77620481. The next prime is 77620511. The reversal of 77620489 is 98402677.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75951225 + 1669264 = 8715^2 + 1292^2 .

It is a cyclic number.

It is not a de Polignac number, because 77620489 - 2³ = 77620481 is a prime.

It is not a weakly prime, because it can be changed into another prime (77620481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38810244 + 38810245.

It is an arithmetic number, because the mean of its divisors is an integer number (38810245).

Almost surely, 2^77620489 is an apocalyptic number.

It is an amenable number.

77620489 is a deficient number, since it is larger than the sum of its proper divisors (1).

77620489 is an equidigital number, since it uses as much as digits as its factorization.

77620489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 169344, while the sum is 43.

The square root of 77620489 is about 8810.2490884197. The cubic root of 77620489 is about 426.5717835752.

The spelling of 77620489 in words is "seventy-seven million, six hundred twenty thousand, four hundred eighty-nine".