89678989 has 4 divisors (see below), whose sum is σ = 89893440. Its totient is φ = 89464540.

The previous prime is 89678977. The next prime is 89678999. The reversal of 89678989 is 98987698.

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 89678989 - 2⁵ = 89678957 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 89678989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (89678929) 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, 106597 + ... + 107434.

It is an arithmetic number, because the mean of its divisors is an integer number (22473360).

Almost surely, 2^89678989 is an apocalyptic number.

It is an amenable number.

89678989 is a deficient number, since it is larger than the sum of its proper divisors (214451).

89678989 is a wasteful number, since it uses less digits than its factorization.

89678989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214450.

The product of its digits is 15676416, while the sum is 64.

The square root of 89678989 is about 9469.8991018912. The cubic root of 89678989 is about 447.6070324383.

It can be divided in two parts, 8967 and 8989, that added together give a square (17956 = 134²).

The spelling of 89678989 in words is "eighty-nine million, six hundred seventy-eight thousand, nine hundred eighty-nine".