78568989 has 8 divisors (see below), whose sum is σ = 109313472. Its totient is φ = 50101920.

The previous prime is 78568979. The next prime is 78568993. The reversal of 78568989 is 98986587.

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 78568989 - 2¹¹ = 78566941 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78568909) 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, 569272 + ... + 569409.

It is an arithmetic number, because the mean of its divisors is an integer number (13664184).

Almost surely, 2^78568989 is an apocalyptic number.

It is an amenable number.

78568989 is a deficient number, since it is larger than the sum of its proper divisors (30744483).

78568989 is a wasteful number, since it uses less digits than its factorization.

78568989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1138707.

The product of its digits is 8709120, while the sum is 60.

The square root of 78568989 is about 8863.9149928234. The cubic root of 78568989 is about 428.3022819454.

The spelling of 78568989 in words is "seventy-eight million, five hundred sixty-eight thousand, nine hundred eighty-nine".