77405609 has 2 divisors, whose sum is σ = 77405610. Its totient is φ = 77405608.

The previous prime is 77405593. The next prime is 77405681. The reversal of 77405609 is 90650477.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54096025 + 23309584 = 7355^2 + 4828^2 .

It is a cyclic number.

It is not a de Polignac number, because 77405609 - 2⁴ = 77405593 is a prime.

It is not a weakly prime, because it can be changed into another prime (77405689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38702804 + 38702805.

It is an arithmetic number, because the mean of its divisors is an integer number (38702805).

Almost surely, 2^77405609 is an apocalyptic number.

It is an amenable number.

77405609 is a deficient number, since it is larger than the sum of its proper divisors (1).

77405609 is an equidigital number, since it uses as much as digits as its factorization.

77405609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52920, while the sum is 38.

The square root of 77405609 is about 8798.0457489149. The cubic root of 77405609 is about 426.1777876942.

The spelling of 77405609 in words is "seventy-seven million, four hundred five thousand, six hundred nine".