78331073 has 2 divisors, whose sum is σ = 78331074. Its totient is φ = 78331072.

The previous prime is 78331063. The next prime is 78331081. The reversal of 78331073 is 37013387.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46881409 + 31449664 = 6847^2 + 5608^2 .

It is a cyclic number.

It is not a de Polignac number, because 78331073 - 2¹² = 78326977 is a prime.

It is a super-2 number, since 2×78331073² = 12271513994662658, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78331013) 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, 39165536 + 39165537.

It is an arithmetic number, because the mean of its divisors is an integer number (39165537).

Almost surely, 2^78331073 is an apocalyptic number.

It is an amenable number.

78331073 is a deficient number, since it is larger than the sum of its proper divisors (1).

78331073 is an equidigital number, since it uses as much as digits as its factorization.

78331073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10584, while the sum is 32.

The square root of 78331073 is about 8850.4843370292. The cubic root of 78331073 is about 427.8695285340.

The spelling of 78331073 in words is "seventy-eight million, three hundred thirty-one thousand, seventy-three".