78028493 has 2 divisors, whose sum is σ = 78028494. Its totient is φ = 78028492.

The previous prime is 78028471. The next prime is 78028499. The reversal of 78028493 is 39482087.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62520649 + 15507844 = 7907^2 + 3938^2 .

It is a cyclic number.

It is not a de Polignac number, because 78028493 - 2⁶ = 78028429 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 78028493.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78028499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39014246 + 39014247.

It is an arithmetic number, because the mean of its divisors is an integer number (39014247).

Almost surely, 2^78028493 is an apocalyptic number.

It is an amenable number.

78028493 is a deficient number, since it is larger than the sum of its proper divisors (1).

78028493 is an equidigital number, since it uses as much as digits as its factorization.

78028493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 78028493 is about 8833.3738175173. The cubic root of 78028493 is about 427.3178878463.

The spelling of 78028493 in words is "seventy-eight million, twenty-eight thousand, four hundred ninety-three".