78420599 has 2 divisors, whose sum is σ = 78420600. Its totient is φ = 78420598.

The previous prime is 78420583. The next prime is 78420613. The reversal of 78420599 is 99502487.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78420599 - 2⁴ = 78420583 is a prime.

It is a super-2 number, since 2×78420599² = 12299580695037602, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78420509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39210299 + 39210300.

It is an arithmetic number, because the mean of its divisors is an integer number (39210300).

Almost surely, 2^78420599 is an apocalyptic number.

78420599 is a deficient number, since it is larger than the sum of its proper divisors (1).

78420599 is an equidigital number, since it uses as much as digits as its factorization.

78420599 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 181440, while the sum is 44.

The square root of 78420599 is about 8855.5405820311. The cubic root of 78420599 is about 428.0324730799.

The spelling of 78420599 in words is "seventy-eight million, four hundred twenty thousand, five hundred ninety-nine".