78296399 has 2 divisors, whose sum is σ = 78296400. Its totient is φ = 78296398.

The previous prime is 78296381. The next prime is 78296411. The reversal of 78296399 is 99369287.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78296399 - 2¹² = 78292303 is a prime.

It is a super-2 number, since 2×78296399² = 12260652192734402, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78296399.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78292399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39148199 + 39148200.

It is an arithmetic number, because the mean of its divisors is an integer number (39148200).

Almost surely, 2^78296399 is an apocalyptic number.

78296399 is a deficient number, since it is larger than the sum of its proper divisors (1).

78296399 is an equidigital number, since it uses as much as digits as its factorization.

78296399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1469664, while the sum is 53.

The square root of 78296399 is about 8848.5252443557. The cubic root of 78296399 is about 427.8063857007.

The spelling of 78296399 in words is "seventy-eight million, two hundred ninety-six thousand, three hundred ninety-nine".