78297673 has 2 divisors, whose sum is σ = 78297674. Its totient is φ = 78297672.

The previous prime is 78297617. The next prime is 78297677. The reversal of 78297673 is 37679287.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40806544 + 37491129 = 6388^2 + 6123^2 .

It is a cyclic number.

It is not a de Polignac number, because 78297673 - 2¹⁷ = 78166601 is a prime.

It is a super-2 number, since 2×78297673² = 12261051194429858, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78297677) 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, 39148836 + 39148837.

It is an arithmetic number, because the mean of its divisors is an integer number (39148837).

Almost surely, 2^78297673 is an apocalyptic number.

It is an amenable number.

78297673 is a deficient number, since it is larger than the sum of its proper divisors (1).

78297673 is an equidigital number, since it uses as much as digits as its factorization.

78297673 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 889056, while the sum is 49.

The square root of 78297673 is about 8848.5972334602. The cubic root of 78297673 is about 427.8087060389.

The spelling of 78297673 in words is "seventy-eight million, two hundred ninety-seven thousand, six hundred seventy-three".