77704069 has 2 divisors, whose sum is σ = 77704070. Its totient is φ = 77704068.

The previous prime is 77704063. The next prime is 77704103. The reversal of 77704069 is 96040777.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76335169 + 1368900 = 8737^2 + 1170^2 .

It is a cyclic number.

It is not a de Polignac number, because 77704069 - 2¹⁵ = 77671301 is a prime.

It is a super-2 number, since 2×77704069² = 12075844678313522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77704063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38852034 + 38852035.

It is an arithmetic number, because the mean of its divisors is an integer number (38852035).

Almost surely, 2^77704069 is an apocalyptic number.

It is an amenable number.

77704069 is a deficient number, since it is larger than the sum of its proper divisors (1).

77704069 is an equidigital number, since it uses as much as digits as its factorization.

77704069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 74088, while the sum is 40.

The square root of 77704069 is about 8814.9911514420. The cubic root of 77704069 is about 426.7248362938.

The spelling of 77704069 in words is "seventy-seven million, seven hundred four thousand, sixty-nine".