89715821 has 8 divisors (see below), whose sum is σ = 99949080. Its totient is φ = 79958592.

The previous prime is 89715793. The next prime is 89715823. The reversal of 89715821 is 12851798.

It can be written as a sum of positive squares in 4 ways, for example, as 1562500 + 88153321 = 1250^2 + 9389^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 89715821 - 2⁶ = 89715757 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (89715823) 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, 118610 + ... + 119363.

It is an arithmetic number, because the mean of its divisors is an integer number (12493635).

Almost surely, 2^89715821 is an apocalyptic number.

It is an amenable number.

89715821 is a deficient number, since it is larger than the sum of its proper divisors (10233259).

89715821 is a wasteful number, since it uses less digits than its factorization.

89715821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238015.

The product of its digits is 40320, while the sum is 41.

The square root of 89715821 is about 9471.8435903471. The cubic root of 89715821 is about 447.6683028499.

The spelling of 89715821 in words is "eighty-nine million, seven hundred fifteen thousand, eight hundred twenty-one".