77678233 has 2 divisors, whose sum is σ = 77678234. Its totient is φ = 77678232.

The previous prime is 77678203. The next prime is 77678261. The reversal of 77678233 is 33287677.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41822089 + 35856144 = 6467^2 + 5988^2 .

It is a cyclic number.

It is not a de Polignac number, because 77678233 - 2¹⁷ = 77547161 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77678233.

It is not a weakly prime, because it can be changed into another prime (77678203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38839116 + 38839117.

It is an arithmetic number, because the mean of its divisors is an integer number (38839117).

Almost surely, 2^77678233 is an apocalyptic number.

It is an amenable number.

77678233 is a deficient number, since it is larger than the sum of its proper divisors (1).

77678233 is an equidigital number, since it uses as much as digits as its factorization.

77678233 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 296352, while the sum is 43.

The square root of 77678233 is about 8813.5255715293. The cubic root of 77678233 is about 426.6775368189.

The spelling of 77678233 in words is "seventy-seven million, six hundred seventy-eight thousand, two hundred thirty-three".