78049589 has 4 divisors (see below), whose sum is σ = 78807456. Its totient is φ = 77291724.

The previous prime is 78049577. The next prime is 78049597. The reversal of 78049589 is 98594087.

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: 98594087 = 283 ⋅348389.

It is a cyclic number.

It is not a de Polignac number, because 78049589 - 2²⁰ = 77001013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78049889) 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, 378779 + ... + 378984.

It is an arithmetic number, because the mean of its divisors is an integer number (19701864).

Almost surely, 2^78049589 is an apocalyptic number.

It is an amenable number.

78049589 is a deficient number, since it is larger than the sum of its proper divisors (757867).

78049589 is a wasteful number, since it uses less digits than its factorization.

78049589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 757866.

The product of its (nonzero) digits is 725760, while the sum is 50.

The square root of 78049589 is about 8834.5678445524. The cubic root of 78049589 is about 427.3563946598.

The spelling of 78049589 in words is "seventy-eight million, forty-nine thousand, five hundred eighty-nine".