78873289 has 4 divisors (see below), whose sum is σ = 86043600. Its totient is φ = 71702980.

The previous prime is 78873281. The next prime is 78873329. The reversal of 78873289 is 98237887.

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.

It is a cyclic number.

It is not a de Polignac number, because 78873289 - 2³ = 78873281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78873281) 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, 3585139 + ... + 3585160.

It is an arithmetic number, because the mean of its divisors is an integer number (21510900).

Almost surely, 2^78873289 is an apocalyptic number.

It is an amenable number.

78873289 is a deficient number, since it is larger than the sum of its proper divisors (7170311).

78873289 is a wasteful number, since it uses less digits than its factorization.

78873289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7170310.

The product of its digits is 1354752, while the sum is 52.

The square root of 78873289 is about 8881.0635061348. The cubic root of 78873289 is about 428.8545120589.

The spelling of 78873289 in words is "seventy-eight million, eight hundred seventy-three thousand, two hundred eighty-nine".