78150769 has 2 divisors, whose sum is σ = 78150770. Its totient is φ = 78150768.

The previous prime is 78150731. The next prime is 78150773. The reversal of 78150769 is 96705187.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56806369 + 21344400 = 7537^2 + 4620^2 .

It is a cyclic number.

It is not a de Polignac number, because 78150769 - 2¹³ = 78142577 is a prime.

It is a super-2 number, since 2×78150769² = 12215085390582722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78150719) 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, 39075384 + 39075385.

It is an arithmetic number, because the mean of its divisors is an integer number (39075385).

Almost surely, 2^78150769 is an apocalyptic number.

It is an amenable number.

78150769 is a deficient number, since it is larger than the sum of its proper divisors (1).

78150769 is an equidigital number, since it uses as much as digits as its factorization.

78150769 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 105840, while the sum is 43.

The square root of 78150769 is about 8840.2923594189. The cubic root of 78150769 is about 427.5409834972.

The spelling of 78150769 in words is "seventy-eight million, one hundred fifty thousand, seven hundred sixty-nine".