89978309 has 4 divisors (see below), whose sum is σ = 90364716. Its totient is φ = 89591904.

The previous prime is 89978303. The next prime is 89978311. The reversal of 89978309 is 90387998.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 51165409 + 38812900 = 7153^2 + 6230^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-89978309 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 (89978303) 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, 192854 + ... + 193319.

It is an arithmetic number, because the mean of its divisors is an integer number (22591179).

Almost surely, 2^89978309 is an apocalyptic number.

It is an amenable number.

89978309 is a deficient number, since it is larger than the sum of its proper divisors (386407).

89978309 is a wasteful number, since it uses less digits than its factorization.

89978309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386406.

The product of its (nonzero) digits is 979776, while the sum is 53.

The square root of 89978309 is about 9485.6896955361. The cubic root of 89978309 is about 448.1044694851.

The spelling of 89978309 in words is "eighty-nine million, nine hundred seventy-eight thousand, three hundred nine".