78293389 has 4 divisors (see below), whose sum is σ = 79173180. Its totient is φ = 77413600.

The previous prime is 78293353. The next prime is 78293393. The reversal of 78293389 is 98339287.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98339287 = 1129 ⋅87103.

It can be written as a sum of positive squares in 2 ways, for example, as 50552100 + 27741289 = 7110^2 + 5267^2 .

It is a cyclic number.

It is not a de Polignac number, because 78293389 - 2¹³ = 78285197 is a prime.

It is a super-2 number, since 2×78293389² = 12259709522210642, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78293309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 439762 + ... + 439939.

It is an arithmetic number, because the mean of its divisors is an integer number (19793295).

Almost surely, 2^78293389 is an apocalyptic number.

It is an amenable number.

78293389 is a deficient number, since it is larger than the sum of its proper divisors (879791).

78293389 is an equidigital number, since it uses as much as digits as its factorization.

78293389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 879790.

The product of its digits is 653184, while the sum is 49.

The square root of 78293389 is about 8848.3551578810. The cubic root of 78293389 is about 427.8009034830.

The spelling of 78293389 in words is "seventy-eight million, two hundred ninety-three thousand, three hundred eighty-nine".