78332669 has 2 divisors, whose sum is σ = 78332670. Its totient is φ = 78332668.

The previous prime is 78332563. The next prime is 78332677. The reversal of 78332669 is 96623387.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78092569 + 240100 = 8837^2 + 490^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78332669 is a prime.

It is a super-2 number, since 2×78332669² = 12272014065327122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78332689) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39166334 + 39166335.

It is an arithmetic number, because the mean of its divisors is an integer number (39166335).

Almost surely, 2^78332669 is an apocalyptic number.

It is an amenable number.

78332669 is a deficient number, since it is larger than the sum of its proper divisors (1).

78332669 is an equidigital number, since it uses as much as digits as its factorization.

78332669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592, while the sum is 44.

The square root of 78332669 is about 8850.5745011270. The cubic root of 78332669 is about 427.8724344695.

The spelling of 78332669 in words is "seventy-eight million, three hundred thirty-two thousand, six hundred sixty-nine".