78889427 has 4 divisors (see below), whose sum is σ = 78928416. Its totient is φ = 78850440.

The previous prime is 78889423. The next prime is 78889429. The reversal of 78889427 is 72498887.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72498887 = 1823 ⋅39769.

It is a cyclic number.

It is not a de Polignac number, because 78889427 - 2² = 78889423 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78889423) 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, 16283 + ... + 20564.

It is an arithmetic number, because the mean of its divisors is an integer number (19732104).

Almost surely, 2^78889427 is an apocalyptic number.

78889427 is a deficient number, since it is larger than the sum of its proper divisors (38989).

78889427 is a wasteful number, since it uses less digits than its factorization.

78889427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38988.

The product of its digits is 1806336, while the sum is 53.

The square root of 78889427 is about 8881.9720220230. The cubic root of 78889427 is about 428.8837588936.

The spelling of 78889427 in words is "seventy-eight million, eight hundred eighty-nine thousand, four hundred twenty-seven".