78955369 has 2 divisors, whose sum is σ = 78955370. Its totient is φ = 78955368.

The previous prime is 78955243. The next prime is 78955379. The reversal of 78955369 is 96355987.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43099225 + 35856144 = 6565^2 + 5988^2 .

It is a cyclic number.

It is not a de Polignac number, because 78955369 - 2¹³ = 78947177 is a prime.

It is a super-2 number, since 2×78955369² = 12467900587852322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78955379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39477684 + 39477685.

It is an arithmetic number, because the mean of its divisors is an integer number (39477685).

Almost surely, 2^78955369 is an apocalyptic number.

It is an amenable number.

78955369 is a deficient number, since it is larger than the sum of its proper divisors (1).

78955369 is an equidigital number, since it uses as much as digits as its factorization.

78955369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2041200, while the sum is 52.

The square root of 78955369 is about 8885.6833727069. The cubic root of 78955369 is about 429.0032238951.

The spelling of 78955369 in words is "seventy-eight million, nine hundred fifty-five thousand, three hundred sixty-nine".