89457821 has 4 divisors (see below), whose sum is σ = 90343644. Its totient is φ = 88572000.

The previous prime is 89457763. The next prime is 89457827. The reversal of 89457821 is 12875498.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12875498 = 2 ⋅6437749.

It can be written as a sum of positive squares in 2 ways, for example, as 67732900 + 21724921 = 8230^2 + 4661^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-89457821 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 (89457827) 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, 442760 + ... + 442961.

It is an arithmetic number, because the mean of its divisors is an integer number (22585911).

Almost surely, 2^89457821 is an apocalyptic number.

It is an amenable number.

89457821 is a deficient number, since it is larger than the sum of its proper divisors (885823).

89457821 is a wasteful number, since it uses less digits than its factorization.

89457821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 885822.

The product of its digits is 161280, while the sum is 44.

The square root of 89457821 is about 9458.2144720872. The cubic root of 89457821 is about 447.2387639168.

The spelling of 89457821 in words is "eighty-nine million, four hundred fifty-seven thousand, eight hundred twenty-one".