78872289 has 8 divisors (see below), whose sum is σ = 105426912. Its totient is φ = 52449600.

The previous prime is 78872279. The next prime is 78872293. The reversal of 78872289 is 98227887.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78872289 - 2¹¹ = 78870241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78872219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31579 + ... + 33984.

It is an arithmetic number, because the mean of its divisors is an integer number (13178364).

Almost surely, 2^78872289 is an apocalyptic number.

It is an amenable number.

78872289 is a deficient number, since it is larger than the sum of its proper divisors (26554623).

78872289 is a wasteful number, since it uses less digits than its factorization.

78872289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65967.

The product of its digits is 903168, while the sum is 51.

The square root of 78872289 is about 8881.0072063928. The cubic root of 78872289 is about 428.8526996315.

The spelling of 78872289 in words is "seventy-eight million, eight hundred seventy-two thousand, two hundred eighty-nine".