78050389 has 4 divisors (see below), whose sum is σ = 78075180. Its totient is φ = 78025600.

The previous prime is 78050327. The next prime is 78050411. The reversal of 78050389 is 98305087.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98305087 = 1109 ⋅88643.

It can be written as a sum of positive squares in 2 ways, for example, as 60326289 + 17724100 = 7767^2 + 4210^2 .

It is a cyclic number.

It is not a de Polignac number, because 78050389 - 2⁷ = 78050261 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 (78053389) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6844 + ... + 14245.

It is an arithmetic number, because the mean of its divisors is an integer number (19518795).

Almost surely, 2^78050389 is an apocalyptic number.

It is an amenable number.

78050389 is a deficient number, since it is larger than the sum of its proper divisors (24791).

78050389 is a wasteful number, since it uses less digits than its factorization.

78050389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24790.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 78050389 is about 8834.6131211276. The cubic root of 78050389 is about 427.3578547740.

The spelling of 78050389 in words is "seventy-eight million, fifty thousand, three hundred eighty-nine".