89977999 has 4 divisors (see below), whose sum is σ = 90449280. Its totient is φ = 89506720.

The previous prime is 89977997. The next prime is 89978023. The reversal of 89977999 is 99977998.

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

It is a cyclic number.

It is not a de Polignac number, because 89977999 - 2¹ = 89977997 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 (89977997) 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, 235354 + ... + 235735.

It is an arithmetic number, because the mean of its divisors is an integer number (22612320).

Almost surely, 2^89977999 is an apocalyptic number.

89977999 is a deficient number, since it is larger than the sum of its proper divisors (471281).

89977999 is a wasteful number, since it uses less digits than its factorization.

89977999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471280.

The product of its digits is 23147208, while the sum is 67.

The square root of 89977999 is about 9485.6733551182. The cubic root of 89977999 is about 448.1039548702.

Subtracting 89977999 from its reverse (99977998), we obtain a palindrome (9999999).

The spelling of 89977999 in words is "eighty-nine million, nine hundred seventy-seven thousand, nine hundred ninety-nine".