78042289 has 8 divisors (see below), whose sum is σ = 87700032. Its totient is φ = 68906640.

The previous prime is 78042259. The next prime is 78042301. The reversal of 78042289 is 98224087.

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

It is a cyclic number.

It is not a de Polignac number, because 78042289 - 2¹⁷ = 77911217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78042259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 130207 + ... + 130804.

It is an arithmetic number, because the mean of its divisors is an integer number (10962504).

Almost surely, 2^78042289 is an apocalyptic number.

It is an amenable number.

78042289 is a deficient number, since it is larger than the sum of its proper divisors (9657743).

78042289 is a wasteful number, since it uses less digits than its factorization.

78042289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261047.

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 78042289 is about 8834.1546850845. The cubic root of 78042289 is about 427.3430706564.

The spelling of 78042289 in words is "seventy-eight million, forty-two thousand, two hundred eighty-nine".