78745889 has 4 divisors (see below), whose sum is σ = 78769200. Its totient is φ = 78722580.

The previous prime is 78745847. The next prime is 78745907. The reversal of 78745889 is 98854787.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98854787 = 37 ⋅2671751.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78745889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78745189) 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, 5507 + ... + 13704.

It is an arithmetic number, because the mean of its divisors is an integer number (19692300).

Almost surely, 2^78745889 is an apocalyptic number.

It is an amenable number.

78745889 is a deficient number, since it is larger than the sum of its proper divisors (23311).

78745889 is a wasteful number, since it uses less digits than its factorization.

78745889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23310.

The product of its digits is 4515840, while the sum is 56.

The square root of 78745889 is about 8873.8880430170. Note that the first 3 decimals coincide. The cubic root of 78745889 is about 428.6234853539.

The spelling of 78745889 in words is "seventy-eight million, seven hundred forty-five thousand, eight hundred eighty-nine".