78081293 has 6 divisors (see below), whose sum is σ = 78429834. Its totient is φ = 77734176.

The previous prime is 78081287. The next prime is 78081307. The reversal of 78081293 is 39218087.

It can be written as a sum of positive squares in 3 ways, for example, as 7739524 + 70341769 = 2782^2 + 8387^2 .

It is not a de Polignac number, because 78081293 - 2²⁰ = 77032717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78081233) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 97571 + ... + 98367.

It is an arithmetic number, because the mean of its divisors is an integer number (13071639).

Almost surely, 2^78081293 is an apocalyptic number.

It is an amenable number.

78081293 is a deficient number, since it is larger than the sum of its proper divisors (348541).

78081293 is an frugal number, since it uses more digits than its factorization.

78081293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1423 (or 1110 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 78081293 is about 8836.3619776467. The cubic root of 78081293 is about 427.4142513514.

The spelling of 78081293 in words is "seventy-eight million, eighty-one thousand, two hundred ninety-three".