78406583 has 2 divisors, whose sum is σ = 78406584. Its totient is φ = 78406582.

The previous prime is 78406553. The next prime is 78406621. The reversal of 78406583 is 38560487.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78406583 - 2¹⁸ = 78144439 is a prime.

It is a super-2 number, since 2×78406583² = 12295184515471778, 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 78406583.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78406543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39203291 + 39203292.

It is an arithmetic number, because the mean of its divisors is an integer number (39203292).

Almost surely, 2^78406583 is an apocalyptic number.

78406583 is a deficient number, since it is larger than the sum of its proper divisors (1).

78406583 is an equidigital number, since it uses as much as digits as its factorization.

78406583 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 161280, while the sum is 41.

The square root of 78406583 is about 8854.7491777012. The cubic root of 78406583 is about 428.0069710193.

The spelling of 78406583 in words is "seventy-eight million, four hundred six thousand, five hundred eighty-three".