78780589 has 4 divisors (see below), whose sum is σ = 82205856. Its totient is φ = 75355324.

The previous prime is 78780571. The next prime is 78780599. The reversal of 78780589 is 98508787.

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 78780589 - 2¹⁷ = 78649517 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 (78780509) 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, 1712599 + ... + 1712644.

It is an arithmetic number, because the mean of its divisors is an integer number (20551464).

Almost surely, 2^78780589 is an apocalyptic number.

It is an amenable number.

78780589 is a deficient number, since it is larger than the sum of its proper divisors (3425267).

78780589 is a wasteful number, since it uses less digits than its factorization.

78780589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3425266.

The product of its (nonzero) digits is 1128960, while the sum is 52.

The square root of 78780589 is about 8875.8430022167. The cubic root of 78780589 is about 428.6864348868.

The spelling of 78780589 in words is "seventy-eight million, seven hundred eighty thousand, five hundred eighty-nine".